10800 Realgar

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10800 Realgar Chemical composition : As4S4 C.I. 77085, Pigment Yellow 39 Realgar is the natural orange-red sulphide of arsenic. It is closely related chemically and associated in nature with orpiment. The two minerals are often found in the same deposits. Realgar occurs as a minor constituent in certain ore veins associated with orpiment and other arsenic minerals, with stibnite, lead, gold and silver. It is found in Romania, the former Czechoslovakia, and the former Yugoslavia, Greece, Germany, Italy, Corsica and the western United States. The name is derived from the Arabic rahj al ghar, powder of the mine. The Latin term was sandarach and De Mayerne who was writing in the seventeenth-century referred to it as rubis d'orpiment. Realgar has been found on a few works by Tintoretto and from Bulgarian icons dating from the Middle Ages to the Renaissance. Realgar has also been reported on Indian sixteenth- to seventeenth-century paintings and an eleventh- to thirteenth-century manuscript from Central Asia. Realgar appears to be less permanent and is known to change to orpiment after long exposure to light. Chinese realgar figurines from the eighteenth-century had oxidized to orpiment and arsenious oxide (Daniels). The chemical and physical properties are similar to orpiment. It belongs to the same crystal system (monoclinic). Its color is orange or an orange-red by transmitted light but usually many yellow particles of orpiment can also be seen. The particles of mineral realgar are usually granular, coarse to fine and have a resinous to greasy luster. Excerpts from: Artist's Pigments Vol.3 Elisabeth West Fitzhugh (editor) and Painting Materials Rutherford J. Gettens and George L. Stout Page 1 of 1 Kremer Pigmente GmbH & Co. KG · Hauptstr. 41-47 · DE-88317 Aichstetten ·Tel. 0049 7565 914480 · [email protected] · www.kremer-pigmente.com We do not assume any warranty for the guidance shown above. In any case, we recommend production and evaluation of samples. .

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Stibnite Gold Project
STIBNITE GOLD PROJECT PAYETTE & BOISE NATIONAL FORESTS INTERMOUNTAIN REGION August 22, 2018 STIBNITE MINING DISTRICT, PAYETTE NATIONAL FOREST, KRASSEL RANGER DISTRICT Regarding Locatable Minerals , 36 CFR 228, Subpart A: requires the Forest Service to: "Where conflicting interests Respond to a mining plan, evaluate that plan must be reconciled, the Consider requirements to minimize adverse effects to the extent feasible question shall always be Comply with applicable laws, regulations and answered from the stand- standards for environmental protection point of the greatest good of Assure appropriate reclamation Further respond by following National Environmental the greatest number in the Policy Act (NEPA) processes. long run." - James Wilson, Secretary Per 36 CFR 228.4, the Forest Service is required to take of Agriculture, 1905 in a letter to Gifford action to ensure that “operations are conducted so as, Pinchot, 1st Chief of the Forest Service. where feasible, to minimize adverse environmental impacts on National Forest surface resources. 1 Table of Contents Project Context STIBNITE GOLD Project Location 4 Mining History at Stibnite 5 PROJECT Who is Midas Gold 6 Stibnite Plan of Operations PAYETTE & BOISE NATIONAL Proposed Mining Plan of FOREST - INTERMOUNTAIN REGION Operations 7 Open Pit Mining 8 Anadromous Fish - Tunnel 9 Inventoried Roadless Areas - Why is this project of interest to many Access and Powerline 10 people and organizations? Facilities During Mining Operations 10 5 million recoverable ounces of gold x
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Theoretical Studies on As and Sb Sulfide Molecules
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40 Common Minerals and Their Uses
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10700 Orpiment, King's Yellow PY 39
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Itmd1//8Lhmdq`knesgdLnmsg9Rshamhsd This month’s mineral is among the most collectible of all minerals. Ours come from a Chinese antimony mine that is now recognized as a classic stibnite locality, and our write-up explains the unusual structure and properties of stibnite, describes its remarkable crystals, and details the many uses of antimony. OVERVIEW PHYSICAL PROPERTIES Chemistry: Sb2S3 Antimony Trisulfide, often containing some bismuth Class: Sulfides Group: Stibnite Crystal System: Orthorhombic Crystal Habits: Individual bladed or acicular prisms or jumbled aggregates of prisms, striated lengthwise; prisms often bent or twisted; also as radiated groups and granular and massive forms. Color: Lead-gray and gray-black to steel-gray and silvery-gray, sometimes with a bluish hue; occasionally iridescent; tarnish black. Luster: Metallic Transparency: Opaque Streak: Dark lead-gray Refractive Index: None (opaque) Cleavage: Perfect in one direction lengthwise Figure 1. Stibnite crytals. Fracture: Subconchoidal to irregular; brittle; thin prisms are slightly flexible. Hardness: 2.0 Specific Gravity: 4.6 Luminescence: None Distinctive Features and Tests: Best field identification features are softness; flexibility of thin prisms; and long, bladed and acicular crystal habits. Visually similar to bismuthinite [bismuth trisulfide, Bi2S3], which has considerably more density. Dana Classification Number: 2.11.2.1 NAME Stibnite, pronounced STIBB-nite, derives from stibi, the Greek name for the mineral. Stibnite has formerly been referred to as “antimonite,” “antimonide,” “sulfur antimonide,” “sulfur antimony,” “antimony glance,” “gray antimony,” “gray antimony ore,” “kohl,” “stibi,” “stimmi,” “stibium,” “lupus metallorum,” “platyophthalmite,” and “speissglas.” In current European mineralogical literature, stibnite appears as stibnit, stibnita, and stibnine. Antimony, pronounced ANN-tih-mow-nee, stems from the Latin word for the metal, antimonium, which means “opposed to solitude,” in allusion to its rare occurrence as a native element.
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