COOO
5 — Carbonates
CO₃²⁻
Calcite, Malachite, Azurite, Rhodochrosite
22 specimens in the collection

Carbonates

Built around the carbonate anion CO₃²⁻. A simple acid test — effervescence — is the hallmark diagnostic for most members. Calcite, malachite and rhodochrosite represent the aesthetic and scientific breadth of this class, from cave formations to vivid copper-green crystals.
Acid reactive Perfect cleavage Birefringence

Minerals of the Carbonates class

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Purple cyclic twin aragonite crystal from Spain with a clean reflection.
Aragonite
Clear calcite crystal group standing on metallic gray arsenopyrite from Kosovo.
Arsenopyrite with Calcite and Quartz
Translucent yellow calcite crystals from China on a dark matrix.
Calcite
Calcite (“Phantom” Crystals) on Mottramite
Calcite (“Phantom” Crystals) on Mottramite
Calcite (twinned)
Calcite (twinned)
Calcite on Fluorite
Calcite on Fluorite
Calcite on Fluorite
Calcite on Fluorite
Calcite on Fluorite
Calcite on Fluorite
Calcite on Fluorite
Calcite on Fluorite
Chalcopyrite, Calcite & Dolomite
Chalcopyrite, Calcite & Dolomite
Dolomite
Dolomite
Emerald on Calcite
Emerald on Calcite
Fluorite with Calcite and Barite inclusion
Fluorite with Calcite and Barite inclusion
Galena, Chalcopyrite, Sphalerite & Calcite
Galena, Chalcopyrite, Sphalerite & Calcite
Hausmannite on Manganite & Calcite
Hausmannite on Manganite & Calcite
Quartz (iron-coated) with Dolomite and Calcite
Quartz (iron-coated) with Dolomite and Calcite
Rhodochrosite on Quartz
Rhodochrosite on Quartz
Rosasite
Rosasite
Siderite
Siderite
Sphalerite on Calcite
Sphalerite on Calcite
Sulfur on Aragonite
Sulfur on Aragonite
Wulfenite Pseudocubic, Mimetite & Calcite
Wulfenite Pseudocubic, Mimetite & Calcite