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June, 2019 Volume 43, Number 6 Happy June Everyone! We Are Swinging Into a Busy Time of the Year with Lots Th Editor: Jolene C Happening Over the Next Few Months

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June, 2019 Volume 43, Number 6 Happy June Everyone! We Are Swinging Into a Busy Time of the Year with Lots Th Editor: Jolene C Happening Over the Next Few Months Santa Rosa, California Letter from Your President June, 2019 Happy June everyone! We are swinging into a busy time of the year with lots Volume 43, Number 6 th Editor: Jolene C happening over the next few months. On June 8 we will have our annual picnic. [email protected] The picnic is in lieu of a June meeting. The club will be providing burgers and all the fixings. Other than burgers it’s potluck. Please bring side dishes and/or IN THIS ISSUE: desserts to share with all. Don’t forget we will be judging entries in our Presidents Message 1 thunderegg challenge. You still have time to put the finishing touches on your Upcoming Meeting Notes 2 creations. Look for an email for particulars about the location and timing. Join the Board 2 Board Meeting 3 Unfortunately, atypical atmospheric rivers have triggered high water, a forecast of Cab of Month 3 Word Scramble 3 heavy rain and thus a cancellation of our planned May field trip. Who would have The Mineral… 4 known 2-years ago in the midst of our drought that this would be the case? All Lithium Mining 5 that water is triggering exposure of a new bounty for responsible collection from May Mtg. Update 5 Mother Nature. Tim has some plans for a June fieldtrip on 6/29 that we will share Upcoming Shows 6 Word Scramble Answer 6 shortly. Rock Comics 6 Chert 7 It’s also time to get real about our show. At our show meeting last night we spent Ken Evans Rest in Peace 8 lots of quality time identifying our support needs, the tactics/strategies for Show Volunteer Ops. 9 engaging all of you to fill those roles and then how we best prepare everyone for Club Info 10 the roles to be played at the show. We all need to remember our commitment to supporting the show by doing what we can. Please find a way to clear your calendars for the October 19/20 weekend. If everyone does their part it will Next General Meeting ensure best possible outcomes for our club and our public stakeholders. Plus it ensure we don’t burn out our core group of members who we rely on to always June 8, 2019 keep humming along. So please, ask what you can do to help. Be ready for us to Howarth Park come tapping on your shoulder if you don’t. 630 Summerfield Road I hope to see all of you at the picnic! Santa Rosa 12:00 pm Ken July Club Meeting –June 26 7:30 pm PROGRAM: Rescheduled because of the 4th of July Picnic Have Fun!! Thunder Egg Challenge Be Safe and Sane!! Rocko http://www.geologypage.com/2016/10/thunderegg.html Gem-N-I…..June, 2019 Page 1 June Picnic Meeting **Remember your Thunder Egg Challenge Entry** *Potluck lunch – bring a dish to share *ROCKO – Always a favorite activity *Feel free to bring your latest rock discovery to share with folks. ***July Club Meeting rescheduled to June 26*** Nicole Meyer will be speaking about Volcanic Activity in our area. Lost Wax Casting Play Day June 14 – 6:30 – 9:30 pm June 15 – 9 am – 5 pm For more information Contact Heidi – 707-291-8904 It’s time to STEP UP and Join the Board! Club elections will be here before you know it and I don’t want you to miss out on your chance to become more involved with your club. You are all encouraged to take on a Board Position or at least a Committee Job. There will be 2 positions that need new people next year. TREASURER: The current treasurer has held the job for 2 years and that is the limit according to our Bylaws. * The treasurer attends the General and Board meetings. * They take in and deposit all of the monies for the club. *Pay the bills and file simple tax reports. (not like personal taxes at all) *Prepare monthly financial reports. Time spent on this job, not including meetings, is 4 – 6 hours/month. CFMS DIRECTOR: Our current CFMS Rep is moving out of state. *The CFMS Rep receives monthly newsletters from CFMS and reports to the club what is happening with CFMS. *They are encouraged to attend at least one of the two annual meetings. *They are the communication liaison between us and CFMS. If you have questions about either job, please ask Jolene about the Treaurer or Heidi about CFMS. It’s time to step up and take your turn for your club Gem-N-I…..June, 2019 Page 2 Board Meeting Cab of the Month The May meeting kicked off our first ever Cab-of-the-Month contest. The April Board Meeting There were 8 entries this first time. They were all lovely. The members voted and choses this as the winner. This Cab was created and Will be held entered by Erica T. Congratulations Erica! June 19, The next contest will be at the July ~7:00~ meeting. Therefore, any cab created in May At the Workshop Or June will be eligible for the competition. Can you find the hidden crystal? If you spot it, fill out the form at the next General Meeting. You will be entered Looking forward to seeing some more beautiful creations! into a drawing for a prize. Good Luck! Rocks and Minerals Word Scramble The Mineral…. Instructions: Unscramble the letters to find the rock and mineral words from the list This month I am featuring a below. rock instead of a mineral. I have had to get my eruftlio __ __ __ __ __ __ __ __ information from Geology.com https://geology.com/rocks/chert.shtml as minerals.net did not have lseatarab __ __ __ __ __ __ __ __ __ extensive information about Chert. grnaiet __ __ __ __ __ __ __ I hope you enjoy and even learn a thing or two. Feel free to visit the site for Dioeprt __ __ __ __ __ __ __ information on other minerals. Rtuzqa __ __ __ __ __ __ Jolene Cepimu __ __ __ __ __ __ Eubixat __ __ __ __ __ __ __ Ooelimtd __ __ __ __ __ __ __ __ Thunderegg http://www.ge Ltneoesim __ __ __ __ __ __ __ __ __ ologypage.com /2016/10/thun deregg.html Iietobt __ __ __ __ __ __ __ Gem-N-I…..June, 2019 Page 3 CHERT—A ROCK, NOT A MINERAL Chert is a sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO2). It occurs as nodules, concretionary masses, and as layered deposits. Chert breaks with a conchoidal fracture, often producing very sharp edges. Early people took advantage of how chert breaks and used it to fashion cutting tools and weapons. "Chert" and "flint" are names used for the same material. Both are varieties of chalcedony. Chert can form when microcrystals of silicon dioxide grow within soft sediments that will become limestone or chalk. In these sediments, enormous numbers of silicon dioxide microcrystals grow into irregularly-shaped nodules or concretions when dissolved silica is transported to the formation site by the movement of groundwater. If the nodules or concretions are numerous, they can grow large enough to merge with one another to form a nearly continuous layer of chert within the sediment mass. Chert formed in this manner is a chemical sedimentary rock. Some of the silicon dioxide in chert is thought to have a biological origin. In some parts of the ocean and in shallow seas, large numbers of diatoms and radiolarians live in the water. These organisms have a glassy silica skeleton. Some sponges also produce "spicules" that are composed of silica. When these organisms die, their silica skeletons fall to the bottom, dissolve, recrystallize, and might become part of a chert nodule. In some areas the sedimentation rate of these materials is high enough to produce rock layers that are thick and laterally extensive. Chert formed in this way could be considered a biological sedimentary rock. Chert is a microcrystalline silicon dioxide (SiO2). As chert nodules or concretions grow within a sediment mass, their growth can incorporate significant amounts of the surrounding sediment as inclusions. These inclusions can impart a distinctive color to the chert. What Color is Chert? Chert occurs in a wide variety of colors. Continuous color gradients exist between white and black or between cream and brown. Green, yellow, orange, and red cherts are also common. The darker colors often result from inclusions of mineral matter and organic matter. Abundant iron oxides in the chert can produce a red color. The name "jasper" is frequently used for these reddish cherts. Abundant organic material can produce gray or black chert. The name "flint" is often used in reference to the darker colors of chert. Chert has very few uses today; however, it was a very important tool-making material in the past. Chert has two properties that made it especially useful: 1) it breaks with a conchoidal fracture to form very sharp edges, and, 2) it is very hard (7 on the Mohs Scale). The edges of broken chert are sharp and tend to retain their sharpness because chert is a very hard and very durable rock. Thousands of years ago people discovered these properties of chert and learned how to intentionally break it to produce cutting tools such as knife blades, arrowheads, scrapers, and ax heads. Tons of chert fragments have been found at locations where these objects were produced in what was one of the earliest manufacturing activities of people.
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