4.1 x 2.1 x 1.3 Inches 10.5 x 5.5 x 3.5 Centimeters
Calcite is a rock-forming mineral with a chemical formula of CaCO3. It is extremely common and found throughout the world in sedimentary, metamorphic, and igneous rocks. Some geologists consider it to be a "ubiquitous mineral" - one that is found everywhere.
Calcite is the principal constituent of limestone and marble. These rocks are extremely common and make up a significant portion of Earth's crust. They serve as one of the largest carbon repositories on our planet.
The properties of calcite make it one of the most widely used minerals. It is used as a construction material, abrasive, agricultural soil treatment, construction aggregate, pigment, pharmaceutical and more. It has more uses than almost any other mineral.
Most minerals fluoresce a single color - Calcite has been known to fluoresce red, blue, white, pink, green, and orange.
Dioptase was named in 1797. Its name is derived from a combination of the Greek words Dia, which means "through" and Optasia, which means "to see". This is regarding the ability to see internal cleavage planes within transparent to translucent crystals of Dioptase.
Dioptase is an uncommon mineral found mostly in desert regions where it forms as a secondary mineral in the oxidized zone of copper sulfide mineral deposits. However, the process of its formation is not simple, the oxidation of copper sulfides should be insufficient to crystallize dioptase as silica is normally minutely soluble in water except at highly alkaline pH. The oxidation of sulfides will generate highly acidic fluids rich in sulfuric acid that should suppress silica solubility. However, in dry climates and with enough time, especially in areas of a mineral deposit where acids are buffered by carbonate, minute quantities of silica may react with dissolved copper forming dioptase and chrysocolla.
The Altyn Tube mine in Kazakhstan still provides handsome specimens; a brownish quartzite host distinguishes its specimens from other localities. The finest specimens of all were found at the Tsumeb Mine in Tsumeb, Namibia. Tsumeb dioptase is transparent and often highly sought after by collectors. Dioptase is also found in the deserts of the southwestern US. A notable occurrence is the old Mammoth-Saint Anthony Mine near Mammoth, Arizona where small crystals that make fine micromount specimens are found. In addition, many small, pale-green colored crystals of dioptase have come from the Christmas Mine near Hayden, Arizona. Another classic locality for fine specimens is Renéville, Congo-Brazzaville. Finally, an interesting occurrence is the Malpaso Quarry in and near Agua de Oro Argentina. Here, tiny bluish-green dioptase is found on and in quartz. It appears at this occurrence, dioptase is primary and has crystallized with quartz, native copper, and malachite.
MINERALS: We guarantee the mineral specimen you purchase will be the exact item you receive. It is important to us that you enjoy your mineral specimen as much as we enjoyed sourcing it for you. We use professional photography and video to show you every inch of the specimen using optimal lighting/setup conditions. If you want to view a specimen from a certain angle or lighting source we are happy to provide more images/videos at your request.
Minerals over $1,000 include a certificate of authenticity from Invenio Fine Minerals. We only issue a certificate of authenticity for minerals we sell.
Measurement Descriptions: Thumbnail: 0.2 to 3 Centimeters / .0625 - 1.118 Inches Miniature: 3+ to 5 Centimeters / 1.125 - 1.96 Inches Cabinet: 5+ to 9.5 Centimeters / 2.0 - 3.7 Inches Large Cabinet: Greater than 10 Centimeters / Greater than 4 Inches
Minerals pictured attached to an acrylic base will be delivered attached to the base. We can unmount the specimen for you if you prefer. We offer basic and custom mineral mounting services, contact us for more info.
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Tracking is included on every purchase Insurance is optional, please read below
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We only ship orders to the UK and EU with a value over $200 USD
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Insurance is not included on international orders.
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Please unpack your mineral/s with care, we are not responsible for damage during unpacking.