Barite (Desert Diamond)
Barite (Barium Sulfate, BaSO4)
mineral
Category
Man Made Object (Coin)
Browse man made object (coin) specimens identified by the Rock Identifier community.
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Limestone
Calcium Carbonate (CaCO3)
sedimentary
Mangano Calcite
Manganocalcite (Ca,Mn)CO3
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Green Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Dyed Howlite (Purple)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Golden Calcite
Calcium Carbonate (CaCO3)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Banded Calcite
Calcium Carbonate (CaCO3)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Calcite in Matrix
Calcium Carbonate (CaCO3)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Limestone Cobble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone with Crinoid Stem
Bioclastic Limestone (CaCO3)
sedimentary
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Chalk
Micrite (primarily Calcium Carbonate, CaCO3)
sedimentary
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Amethyst cluster
Amethyst, purple quartz (SiO₂)
mineral
Polished amethyst pyramid
Amethyst, purple quartz (SiO₂)
mineral
Silver (Native Silver/Alloy Specimen)
Ag (Native Silver element), specifically a 90% Ag / 10% Cu alloy
mineral
Banded Calcite (often commercially called 'Mexican Onyx')
Calcium Carbonate (CaCO3)
mineral
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Native Copper (in coinage alloy)
Copper (Cu)
mineral
White Calcite
Calcium Carbonate (CaCO3)
mineral
Diamond (or Cubic Zirconia simulant)
Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ
mineral
Diamond
Carbon (C)
mineral
Moissanite
Silicon Carbide (SiC)
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Gabbro
Gabbro (Mg, Fe)2Si2O6 / CaAl2Si2O8
igneous
Blue Goldstone
Synthetic glass with copper or cobalt/manganese inclusions
man-made glass
Blue Goldstone
Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)
man-made glass
Blue Goldstone
Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)
man-made glass
Green Glass Slag
Amorphous Silicon Dioxide (SiO2) with metal oxide impurities
mineraloid (man-made)
Porcelain (Stoneware Ceramic)
Mullite / Silica-glass composite (Al6Si2O13)
metamorphic (man-made)
Glass Nugget (Tumbled Glass)
Amorphous Silicon Dioxide (SiO2) with additives
mineraloid (man-made)
Goldstone (Brown)
Aventurine glass
mineraloid (man-made)
Crinoid Columnal Fossil
Class Crinoidea (Echinodermata); usually calcite replacement (CaCO3)
sedimentary
Large calcite crystal cluster
Calcite (calcium carbonate, CaCO₃)
mineral