Pyrite
Iron Pyrite (FeS2)
mineral
Category
Sedimentary And Igneous
Browse sedimentary and igneous specimens identified by the Rock Identifier community.
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Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Common Opal
SiO2·nH2O (Hydrated Silicon Dioxide)
mineraloid
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Silicon dioxide (chalcedony variety), SiO2
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Mossy Rock
Mixed lithology rock with Bryophyta (moss)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pink Feldspar
Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8
mineral
Muscovite
KAl2(AlSi3O10)(OH)2
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Hematite
Hematite (Α-Fe2O3)
mineral
Potassium Feldspar and Quartz
KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Chalcedony (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Pyrite in Matrix (often with Chalcopyrite)
Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)
mineral
Quartz Fragment
Silicon Dioxide (SiO2)
mineral
Calcite (Optical or Clear Calcite)
Calcium Carbonate (CaCO3)
mineral
Quartz
Silicon dioxide (SiO2)
Mineral
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
mineral
Granite or Granitic Gneiss
Granitoid / Gneiss
Igneous / Metamorphic
Calcite
Calcium Carbonate (CaCO3)
mineral
Dalmatian Jasper
Peralkaline Feldspar Rhyolite
igneous
Dalmatian Stone
Dalmatian Jasper (Aplitic Rock)
igneous
Dalmatian Jasper
Peralkaline Quartz Feldspar Porphyry
igneous
Dalmatian Stone
Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock
igneous
Dalmatian Jasper
Dalmatian Stone (comprised of Feldspar, Quartz, and Arfvedsonite)
igneous
Fossiliferous limestone
Bioclastic limestone, commonly crinoidal or shelly limestone (calcite, CaCO₃)
sedimentary
Magnetite (Loadstone candidate)
Iron(II,III) oxide (Fe3O4)
mineral
Pyrite
Iron Pyrite (FeS2)
Mineral
Weathered sandstone or arkosic sandstone
Clastic sandstone, likely quartz–feldspar-rich (arkose)
sedimentary
River Stone (River Rock)
Smooth Clastic Sedimentary Rock
sedimentary