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Pseudobrookite, Hematite, Cristobalite, Wannenkopfe Quarry, Germany, photo by Fred Kruijen
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Cristobalite in manganese oxide-chromia-silica
Inclusion formula: SiO2 Inclusion type (Macro/Micro/Nano): Macro Inclusion type (Exogenous/Indigenous): Indigenous Inclusion classification: Oxide Inclusion composition in weight %: C-Cristobalite with 98% SiO2, traces of Cr and Mn, M-Matrix with 14% MnO, 31% SiO2, 57% Cr2O3. Mean analysis (calc.) 13% MnO, 22% SiO3, 54% Cr2O3. Sample: Ferrochromium suraffine Steel composition in weight %: 73% Cr, 0.03% C, 0.09% Si, balance is Fe. Note: This inclusion in situ in ferrochromium is similar in appearance to the isolated inclusion from a caron steel shown in the inclusion No. 9. The matrix in this particle has, however, a large chromina content and is composed of a two phases. It was not possible to carry out a separate analysis of each of the two phases because of the limited resolution of the electron probe analyser.
Source.
🍇🌵🍇#BestOfTucson . Now that Tucson 2020 is Officially Over, we’ll be Celebrating the World Famous Event with a Best of Series to Showcase Some of Tucson’s Finest! . What Better Way to Kickoff the Series than with a Mineral Most People have Never Heard of, “Cristobalite”! . Cristobalite is a “Mineral Polymorph of Silica that is Formed at Very High Temperatures. It has the same chemical formula as quartz, SiO₂, but has a Distinct Crystal Structure. It’s Commonly used in Dentistry but in this Video can be Seen as Golden Doughnut Like Inclusions in the Amethyst Crystals! . I have Seen these Inclusions Before but Never as Perfectly Displayed or in Such a Large Specimen as this 1,200 pound Amethyst Geode from Brazil! . It’s Difficult to Describe what the Inclusions Actually Look Like in Person. They are Doughnut Shaped Fluffy Needle Like Inclusions with Rich Golden Color! . The Contrast of Brilliant Gold and Deep Purple Color is Something no Video will Ever do Justice to and out of ALL the Museum Quality Pieces I Saw, this was One of my Personal Favorites! . Stay Tuned for More Breathtaking Content from Northern Maine Minerals Best Of Tucson 2020 Series and Don’t Forget to Check us out Online for More Beautiful Crystals from Around the World! . Stores.ebay.com/Northern-Maine-Minerals . Etsy.com/Shop/NmmRockShop . Now Accepting Best Offers on ALL Northern Maine Minerals Online and In-Store Inventory! . #NorthernMaineMinerals #NmmRockShop . #Amethyst #Cristobalite #MaineRockShop #CrystalPorn #Minerals #Crystals #AmethystGeode #TucsonGemShow #Quartz #Rockhounds #QuartzCluster #HomeDecor #CrystalShop . 🍇💎🍇🌵🍇💎🍇 (at Tucson, Arizona) https://www.instagram.com/p/B8xYvPSACPt/?igshid=1gh33rmmxbnpm
Cristobalite, Hematite
SiO2, Fe2O3
Locality:
Caspar quarry, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany
An interesting homoepitactic intergrowth from brown and black hematite
Photo: Michael Förch
Cristobalite is a silica polymorph that is thermodynamically stable only at temperatures above 1470°C, up to the melting point at 1705°C, at atmospheric pressures. It commonly metastably persists or even forms at much lower temperatures in silica-rich volcanic and sedimentary environments. It can form crystals in cavities, probably vapour-deposited, or spherulites in obsidian or other silicic volcanics.
Hematite is rather variable in its appearance - it can be in reddish brown, ocherous masses, dark silvery-grey scaled masses, silvery-grey to black crystals, and dark-grey masses, to name a few. What they all have in common is a rust-red streak.
From Mindat.Org Photo Of The Day; January 26, 2018:
Cristobalite: SiO2; Hematite: Fe2O3
Locality: Caspar quarry, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany
“An interesting homoepitactic intergrowth of brown and black hematite. Collection: Heinz Förch Photo: Michael Förch”
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Cristobalite
Cristobalite Market Size 2023, Forecast By 2032
Global Cristobalite Market, By Type (Whole Kernel or Grain, Crushed), Form (Sand, Milled Flour), Application (Construction Activities, Glass and Ceramics, Paints and Coatings, Foundry Castings, Sports and Leisure Goods, Metallurgical Application, Industrial Chemicals, Oil Field Chemicals, Others), Country (U.S., Canada, Mexico, Brazil, Argentina, Rest of South America, Germany, France, Italy, U.K., Belgium, Spain, Russia, Turkey, Netherlands, Switzerland, Rest of Europe, Japan, China, India, South Korea, Australia, Singapore, Malaysia, Thailand, Indonesia, Philippines, Rest of Asia-Pacific, U.A.E, Saudi Arabia, Egypt, South Africa, Israel, Rest of Middle East and Africa) Industry Trends and Forecast to 2028
Amethyst with Goethite and Cristobalite Cluster All of you know Amethyst. Some of you know Goethite. And fewer will recognize the name Cristobalite, but you probably have seen it! It is the "Snowflake" in Snowflake Obsidian. The combination of these 3 stones is pretty incredible. It combines the high vibing and uplifting energy of amethyst with the grounding, protective and radiating Goethite and throw in the positive mindset of Cristobalite and it feels like you can do anything. This cluster has a very cheerful, almost bubbly energy and even though it is big and weighs about 2 kilos, it feels great to hold. Pale purples and some periwinkle on these lovely points with a few rainbows, and even a few phantoms. Available at Pop-ups this weekend! Friday at Morpho Gallery 6 to 9 PM Saturday at Ojo de Fortuna 1 to 3 PM #goethite #goethiteinamethyst #buycrystals #goethiteincludedamethyst #cristobalite #cristobaliteinamethyst #crystalcluster #amethystcluster #amethystcristobalite #highvibes #grounding #positivethinking #periwinkle #crystalforsale #chicagopopupshop #phantomamethyst https://www.instagram.com/p/B9XB-AQBROe/?igshid=1hypqryri8ony
