CMLC Newsletter Oct 2020
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Symposium on Agate and Cryptocrystalline Quartz
Symposium on Agate and Cryptocrystalline Quartz September 10 – 13, 2005 Golden, Colorado Sponsored by Friends of Mineralogy, Colorado Chapter; Colorado School of Mines Geology Museum; and U.S. Geological Survey 2 Cover Photos {top left} Fortification agate, Hinsdale County, Colorado, collection of the Geology Museum, Colorado School of Mines. Coloration of alternating concentric bands is due to infiltration of Fe with groundwater into the porous chalcedony layers, leaving the impermeable chalcedony bands uncolored (white): ground water was introduced via the symmetric fractures, evidenced by darker brown hues along the orthogonal lines. Specimen about 4 inches across; photo Dan Kile. {lower left} Photomicrograph showing, in crossed-polarized light, a rhyolite thunder egg shell (lower left) a fibrous phase of silica, opal-CTLS (appearing as a layer of tan fibers bordering the rhyolite cavity wall), and spherulitic and radiating fibrous forms of chalcedony. Field of view approximately 4.8 mm high; photo Dan Kile. {center right} Photomicrograph of the same field of view, but with a 1 λ (first-order red) waveplate inserted to illustrate the length-fast nature of the chalcedony (yellow-orange) and the length-slow character of the opal CTLS (blue). Field of view about 4.8 mm high; photo Dan Kile. Copyright of articles and photographs is retained by authors and Friends of Mineralogy, Colorado Chapter; reproduction by electronic or other means without permission is prohibited 3 Symposium on Agate and Cryptocrystalline Quartz Program and Abstracts September 10 – 13, 2005 Editors Daniel Kile Thomas Michalski Peter Modreski Held at Green Center, Colorado School of Mines Golden, Colorado Sponsored by Friends of Mineralogy, Colorado Chapter Colorado School of Mines Geology Museum U.S. -
About Our Mineral World
About Our Mineral World Compiled from series of Articles titled "TRIVIAL PURSUITS" from News Nuggets by Paul F. Hlava "The study of the natural sciences ought to expand the mind and enlarge the ability to grasp intellectual problems." Source?? "Mineral collecting can lead the interested and inquisitive person into the broader fields of geology and chemistry. This progression should be the proper outcome. Collecting for its own sake adds nothing to a person's understanding of the world about him. Learning to recognize minerals is only a beginning. The real satisfaction in mineralogy is in gaining knowledge of the ways in which minerals are formed in the earth, of the chemistry of the minerals and of the ways atoms are packed together to form crystals. Only by grouping minerals into definite categories is is possible to study, describe, and discuss them in a systematic and intelligent manner." Rock and Minerals, 1869, p. 260. Table of Contents: AGATE, JASPER, CHERT AND .............................................................................................................................2 GARNETS..................................................................................................................................................................2 GOLD.........................................................................................................................................................................3 "The Mystery of the Magnetic Dinosaur Bones" .......................................................................................................4 -
Wyoming Agates WHAT ARE AGATES Chalcedony (Cryptocrystalline Quartz), in Its Pure Form, Is Transparent When Exposed to Concen- Trated Light
Wyoming State Mineral & Gem Society, Inc. JadeAward StateWinning WSMGS Website: wsmgs.orgNews Volume 2019, Issue 2 Wyoming Agates WHAT ARE AGATES Chalcedony (cryptocrystalline quartz), in its pure form, is transparent when exposed to concen- trated light. When a small amount of impurities or foreign materials are added, the color of the cryptocrystalline quartz changes and its ability to transmit light decreases, creating semitransparent to translucent varieties of chalcedony. Agates are a form of chalcedony that contain pat- WSMGS OFFICERS terns caused by impurities within this cryptocrys- President: Jim Gray talline quartz. The most common agate patterns [email protected] caused by impurities are in the form of bands, concentric lines (dendritic), mottled, moss shaped Vice President: Linda Richendifer or plume-like. In addition, these patterns are often [email protected] different in color than the chalcedony that contains it. The book Agates by Karen A. Brzys lists that Secretary: Leane Gray over 16 different agate patterns can be found in [email protected] Wyoming. Treasurer: Stan Strike HOW DO AGATES FORM [email protected] Agates usually form in areas where surface water seeps through igneous rocks or volcanic ash. Historian: Rod Baltes continued on page 2 [email protected] Jade State News Editor: Jennifer Flowers Wyoming Agates Pages ........1-6 [email protected] WSMGS Info & Updates Pages ......7-10 Rockhound of Year Nominations Page .......... 11 RMFMS State Director: Stan Strike Acrylic Rock Painting Pages ... 11, 12 [email protected] Old Bird Found -
Prospecting for and Instructions on How to Finish Fire Agate Gems
Prospecting For And Instructions On How To Finish Fire Agate Gems In this booklet I will do my best to help the lapidarian who wants to start working with Fire Agates as well as those who only need a little help on just how to get started. In turn I will do all that I can to encourage the reader who is not a lapidarian to be able to start a lifetime hobby of it. I will also include as much information as I can possibly find on the subject through researching current books. It has been said that knowledge is wealth. I have found that wealth is not found in monetary means alone. To me happiness is the ultimate wealth. Even if you never do work with rocks, it is nice to learn as we go through life. Who knows it could spark that tad bit of interest that would start you on the road to being a true rock hound for life. In turn be able to share the beautiful world of lapidary with millions of rock hound people around the world, who I feel in my world are among the finest people I have ever had the pleasure of knowing. Sometimes in life it is just that little spark that sets off the interest in your mind that in some way will change your thinking for the remainder of your life. I wish that every child had the opportunity to go out with their parents hunting rocks together and finding the things that set us apart from the other animals on our planet. -
Mineral of the Month Club October 2016
Mineral of the Month Club October 2016 QUARTZ var. AGATE (NODULE) Distinctive multicoloration and banding make this month’s mineral—the agate subvariety of microcrystalline quartz (chalcedony)—one of the world’s most recognizable gemstones. Our agate-nodule specimens were collected, cut, and polished in Soledade, Brazil, the world’s leading source of gem-quality agate. OVERVIEW PHYSICAL PROPERTIES: Chemistry: SiO2 Silicon Dioxide, often containing small amounts of iron and manganese. Class: Silicates Subclass: Tectosilicates (Framework Silicates) Group: Quartz Subgroup: Microcrystalline Quartz (Chalcedony) Crystal System: Hexagonal Crystal Habits: The agate subvariety of microcrystalline quartz occurs in massive form as nodules, veinlets, and geode linings. Color: Red, pink, orange, yellow, green, blue, bluish-gray, gray, white, brown, and black; agate bands, layers, and inclusions are usually multicolored. Luster: Vitreous and waxy to dull Transparency: Translucent Streak: White Refractive Index: 1.544-1.553 Cleavage: None Fracture and Tenacity: Conchoidal to subconchoidal and irregular; brittle to tough. Hardness: Quartz has a Mohs hardness of 7.0; agate is slightly softer at Mohs 6.5-7.0. Specific Gravity: 2.62-2.65 Luminescence: Agate often fluoresces yellow or bluish-white; fluorescence color and intensity vary among individual layers. Distinctive Features and Tests: Agate is difficult to confuse with other minerals or mineral varieties. Best field marks are translucency; microcrystalline structure; multicolored banding, layers, or inclusions; wide range of colors; hardness; relatively low specific gravity; and occurrence in volcanic environments. Dana Classification Number: 75.1.3.1 NAME: The word “agate,” pronounced AAH-get (rhymes with “tag it”), stems from Achatēs, the ancient Greek name for the Dirillo River on Italy’s island of Sicily, a former source of the stone. -
Mineral of the Month Club June 2017
Mineral of the Month Club June 2017 OPAL subvar. FIRE This month our featured mineral is the fire subvariety of common opal from Mexico. Our write- up discusses the mineralogy of fire opal, the origin of its yellow-orange-red coloration, and its classification as a mineraloid. OVERVIEW PHYSICAL PROPERTIES Chemistry: SiO2·nH20 Hydrous Silicon Dioxide, containing varying amounts of water. The fire subvariety of common opal contains traces of hematite and hydrous iron oxides. Class: Silicates Subclass: Tectosilicates (Framework Silicates) Group: Hydrated Tectosilicates Subgroup: Opal Crystal System: None; opal has a noncrystalline structure. Crystal Habits: None; occurs as amorphous fillings or botryoidal coatings in vugs and fissures. Color: Fire opal is always a shade of yellow, orange, or red, or a mix of these colors; color intensity varies from pale to saturated; color zoning and multicoloration is common. Fire opal occasionally exhibits an internal play of green color. Luster: Vitreous to dull Transparency: Transparent to translucent Streak: White Cleavage: None Fracture/Tenacity: Conchoidal; tough. Brittleness increases with level of hydration. Hardness: 5.5-6.0 Specific Gravity: Varies with water content from 1.9 to 2.3; the average specific gravity of all opal varieties is 2.09. The specific gravity of fire opal is about 2.2. Luminescence: Most opal fluoresces pale greenish-yellow in shortwave ultraviolet light and white in long-wave ultraviolet light. Refractive Index: 1.44-1.46 Distinctive Features and Tests: The best field identification marks for fire opal are low density; conchoidal fracture; lack of crystal faces and cleavage planes; yellow- orange-red coloration; and occurrence in rhyolite formations. -
Daisy Mountain Rockchips
Daisy Mountain Rockchips The purpose of Daisy Mountain Rock & Mineral Club is to promote and further an interest in geology, mineralogy, and lapidary arts, through education, field experiences, public service, and friendship. VOLUME 5, ISSUE 12 DECEMBER 2020 This Chalcedony Desert Rose is the G.O.A.T. (Greatest Of All Time) mimetolith. What do you see??? Locality: Aguila area, Maricopa Co., AZ Photo by Stan Celestian Daisy Mountain Rockchips December 2020 2 sard, plasma, and others. Orientation of crystals, color, banding, and inclusions are the basis for the QUARTZ different varieties. (This will all be discussed variety Chalcedony further.) By Susan Celestian Chemical Formula - Si02 To the average rockhound, chalcedony is any Crystal System - Trigonal (3 axes of equal length in one plane, and a 4th at 90o angle to them). Go to https:// microcrystalline quartz - chert, jasper, agate. The www.mindat.org/min-3337.html formation and classification of chalcedony can be , scroll way down to interactive graphic. very confusing. There are literally hundreds of Growth Forms/Habits - massive, botryoidal, terms bandied about in the hobby, not many of mammillary which have scientifically-defined differences. I Luster - Vitreous, waxy HOPE this article can help to clear up the Streak - white now-recognized differences between the varieties Colors - milky, red, brown, yellow, green, orange, blue, of chalcedony, and how to recognize them in the brown, black, patterned, banded, dendritic, plumose field. Information, in this article, will be based on Diaphaneity - Opaque to translucent that published on mindat.com, an online authority Specific Gravity - 2.5-2.9 on worldwide minerals. -
Program Descriptions 1
Program Descriptions 1. CABOCHON MAKING - 40 Slides Showing the basic steps and the beginning methods of cutting a cabochon. Several types of machinery are pictured to aid the beginner in choosing what is best for him. The program is a Discussion maker and time should be allowed for the experienced lapidary to pass along a few tips after the showing. It is a 30 minute program, but interested comments from viewers will add to this. from rock to slab to polished cabochon. Prepared in 1977 by Lapidary Al Dalen and photographer Charles Ramer. 2. INVESTMENT CASTING & MODEL MAKING - 103 Slides Describes the items needed to do investment casting. Beginning with model or pattern complete instructions follow through to the finished product. Beautiful pieces produced by this method are shown. By David Munford. 3. INTRODUCTION TO FACETING - 65 Slides Very informative program to promote the art of faceting. Full details are given on the equipment and the steps required in processing rough materials to a finished stone. By Douglas Lindsey, Henry Thomas & Charles Angelo. 4. MODERN TECHNIQUES OF FACETING - 72 Slides A 60 minute tape, Script and slides carry through all steps to the finished stone on the Fac-ette machine. By and through the courtesy of the Fac-ette Manufacturing Company. 5. 100 Miles of Agate - 90 slides A field trip along 100 miles of Oregon coastline. Agates, driftwood and other materials from this location are shown. The application of these materials for lapidary use and arrangements one can make are shown. By The Tualatin Valley Gem Club, Forest Grove, OR. -
A Location Guide for Rock Hounds in the United States
A Location Guide for Rock Hounds in the United States Collected By: Robert C. Beste, PG 1996 Second Edition A Location Guide for Rock Hounds in the United States Published by Hobbit Press 2435 Union Road St. Louis, Missouri 63125 December, 1996 ii A Location Guide for Rock Hounds in the United States Table of Contents Page Preface..................................................................................................................v Mineral Locations by State Alabama ...............................................................................................................1 Alaska.................................................................................................................11 Arizona ...............................................................................................................19 Arkansas ............................................................................................................39 California ...........................................................................................................47 Colorado .............................................................................................................80 Connecticut ......................................................................................................116 Delaware ..........................................................................................................121 Florida ..............................................................................................................122 -
Teaching Activities For
Teaching Activities for Questions to Ask Before & after reading the book 2 • Questions to ask before reading the book • What do children already know? With charts • After reading the book – writi ng prompts & thi nki ng it through • Re-read the book looking for more information • Comprehension questions • What do children already know activity conclusion Language Arts 8 • Developing a word wall • Vocabulary game • Putting it all together • Suggested vocabulary list • Silly sentence structure acti vity • Sequenci ng sentence strips • Riddle me this • Word search • Write about it! Science 15 • Rocks and minerals all around us • Understanding the rock cycle • Science journal Math 19 • Mineral math • Sorting and attribute graph Research & Geography 20 • What’s mined i n which state/provi nce • State mineral, rock, & gemstone symbols Other 22 • Julie the Rockhound Bingo Teaching Activities are intended for use at home, in the classroom, and duri ng story-times. Copyright © 2007 by Arbordale Publishing formerly Sylvan Dell Publishing Return to Top Questions to ask children before reading the book • What do you think the book is about by looking at the cover? (or one or two of the inside illustrations) Sometimes it is easy to tell from the cover, other times it is not. • What does the cover illustration show? • Does the title tell you what the book is about? What do children already know? • Young children are naturally inquisitive and are sponges for information. The whole purpose of this activity is to help children verify the information they know (or think they know) and to get them thinking “beyond the box” about a particular subject. -
Fairburn Agate – SD State Gemstone (An Excerpt from What Is a Fairburn Agate?
The Topeka Gem and Mineral Society, Inc. 1934 SW 30th St. Topeka, KS 66611 [email protected] 5d www.TopekaGMS or The Topeka Gem & Mineral Society, Inc. Member of Rocky Mountain Federation of Organized December 3, 1948 Mineralogical Societies American Federation of Facebook: Topeka Gem and Mineral Society Field Trips Mineralogical Societies The Glacial Drifter, Vol. 61, No. 3, Mar., 2018 The Purpose of the Topeka Gem & Mineral Society shall be exclusively educational and scientific: (1) to promote interest in geology and the lapidary arts; (2) to encourage the collection and display of rocks, gems, and minerals; (3) to encourage field trips and excursions of a geological, or lapidary nature; and (4) to encourage greater public interest and education in gems and minerals, cooperating with the established institutions in such matters. Meetings: 4th Friday of each month, September to May, 7:30 pm, Stoffer Science Hall, Room 138, Washburn University. No meeting in December unless notified of a change. Picnic meetings are held June, July and August. Dues: Individual, $15.00; Couple, $20.00; Junior (under 18 years of age), $5.00. Dues are collected in December for the following year. Send dues to: Millie Mowry, Treasurer, 1934 SW 30th St, Topeka, KS 66611. www.TopekaGMS.org 2018 OFFICERS AND CHAIRS President Mike Cote 220-3272 Cab of the Month Debra Frantz/Fred Zeferjohn 862-8876 1st Vice Pres. Dave Dillon 272-7804 Field Trip Coord. Will Gilliland 286-0905 nd 2 Vice Pres. Cinda Kunkler 286-1790 Publicity TGMS Board Secretary Colleen Lightwine 350-2958 Welcome/Registration Russ & Rhonda Miller 272-6408 Treasurer Millie Mowry 267-2849 Property M. -
Min-Loc3.Pdf
Ohio OHIO Only Paleozoic rock formations underlie Ohio’s Pleistocene surface debris and Quaternary soils. For long ages Ohio lay beneath a shallow sea which received successively enormous quantities of Ordovician, Silurian, Devonian, Mississippian and Pennsylvanian sediments; the erosional products of some 200 million years. Few, if any Mesozoic rocks appear within the state, but every one of Ohio’s 88 counties is surfaced with Pleistocene debris. The state was buried completely four times by Ice Age glaciers, leaving the land surface nearly level but with some fairly rugged low hills in the southeastern corner. There are few localities containing worthwhile gems or minerals, although excavations in the underlying black, Upper Devonian (New Albany) shales occasionally produces pieces of silicified wood. Ohio ranks first in the nation in the production of limestone and dolomite, and second in the production of clays. Lesser production of iron, petroleum, natural gas and coal from thick beds contributes to the mineral economy. But as far as the collector is concerned, Ohio is unique in but a single gemstone, an exceptionally high quality, colorful flint that is mostly a mixture of chert, translucent chalcedony, jasp-agate and common opal, rivaling in beauty the Arizona agatized wood. This gem flint occurs in the 8 mile long Flint Ridge, between Newark (Licking Co.) and Zanesville (Muskingum Co.), a region of rolling, wooded hills. Here, prehistoric Indians quarried the toolmaking material for arrowheads and other implements. While occurrences are widespread throughout Ohio, the chief deposits of true flint (characterized by ease of working) include the highly colored Vanport flint of the Flint Ridge and the Upper Mercer flint exposed in Hocking, Perry, and Coshocton counties.