Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Organic (Paper And Cellulose)
Browse organic (paper and cellulose) specimens identified by the Rock Identifier community.
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Pyrite
Iron Sulfide (FeS2)
mineral
Granite with Orthoclase and Hematite Staining
Phaneritic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)
igneous
Gowganda Tillite (Puddingstone)
Glacial Tillite (Diamictite) with Jasper inclusions
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Orange Quartzite (or Iron-Stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide impurities (Fe2O3)
metamorphic
Banded Gneiss
Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Polished pink chalcedony (likely pink agate/geode)
Microcrystalline quartz, SiO₂; chalcedony with iron-bearing inclusions and possible druzy quartz
mineral
Slag Glass (Cullet)
Amorphous Silica (man-made), primarily SiO2 with trace metal oxides
Mineraloid / Synthetic Glass
Honey Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Agate (specifically Lace Agate or Banded Agate)
Silicon Dioxide (SiO2)
mineral
Rounded granite pebble
Granite; chiefly quartz, feldspar, and mica
igneous
Limestone (Chalk / Calcite Rock)
Calcium Carbonate (CaCO3)
sedimentary
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(F,OH)2
mineral
Anthracite coal
Anthracite; predominantly carbon (C), with minor mineral ash
metamorphic
Marble
Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Fossilized Brachiopod
Phylum Brachiopoda (General mineral composition: Calcite/CaCO₃ or Silica/SiO₂)
sedimentary
Talc (Soapstone variety)
Talc (Hydrated magnesium silicate) - Mg3Si4O10(OH)2
mineral
Tumbled gray feldspar-rich stone, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, potentially fine-grained granite or quartzite
igneous
Limestone Pebble
Calcium Carbonate (CaCO3)
sedimentary
Blue Dyed Agate Geode
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Tumbled Mineral Collection (Amethyst, Celestite, K2 Jasper, Rose Quartz, Ruby in Zoisite, Que Sera Stone)
Mixed Mineral Specimens (Quartz SiO2, Celestite SrSO4, Corundum Al2O3 with Zoisite, etc.)
mineral
Mica (Biotite or Phlogopite variety)
Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fools Gold)
Iron Sulfide (FeS2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone (Brecciated/Recrystallized)
Calcium Carbonate (CaCO3)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Chinese Writing Stone
Porphyritic Basalt (or Andesite) with Feldspar inclusions
igneous