Granite
Granite (Felsic Plutonic Rock)
Category
Browse mineral (impactite) specimens identified by the Rock Identifier community.
Granite
Granite (Felsic Plutonic Rock)
Granodiorite
Granodiorite
Limonite
FeO(OH)·nH2O
Granite
Intrusive Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
Peacock Ore
Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)
Limonite with Pyrite
Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O
Banded Sandstone (Beach Pebble)
Quartz Arenite Sandstone
Red Sandstone (Iron-stained)
Clastic sedimentary rock (primarily Quartz with Iron Oxides)
Turquoise
Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
Blue Apatite
Apatite (Ca5(PO4)3(F,Cl,OH))
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
Fluorite
Calcium fluoride (CaF2)
Malachite and Azurite on Gossan (Ironstone Matrix)
Cu2CO3(OH)2 (Malachite) on FeO(OH)·nH2O (Limonite/Gossan)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Limonite with Quartz
Hydrated Iron Oxide Hydroxide, FeO(OH)·nH₂O with SiO₂
Proustite
Proustite (Ag3AsS3)
Pegmatite (Feldspar and Quartz)
Pegmatite (KAlSi3O8 / SiO2)
Fluorite
Calcium Fluoride (CaF2)
Likely quartz-rich mineral fragment
Quartz (SiO₂), possibly iron-stained or included quartz
Snowflake Obsidian
Obsidian with Cristobalite inclusions
Granitic Pegmatite with Schorl Tourmaline
Granitic Pegmatite (Schorl: NaFe3Al6(BO3)3Si6O18(OH)4)
Vesicular basalt (likely weathered lava rock)
Vesicular basalt; primarily plagioclase feldspar, pyroxene, and volcanic glass, with possible iron-oxide alteration
Limonite
FeO(OH)·nH2O
Selenite (variety of Gypsum)
Calcium sulfate dihydrate (CaSO4·2H2O)
Hematite
Iron(III) oxide (Fe2O3)
Hematite (likely Botryoidal or Specularite variant)
Iron(III) oxide (Fe2O3)
Hematite
Hematite (Iron(III) oxide, Fe2O3)
Native Copper Nugget
Native Copper (Cu)
Geode (Calcite or Quartz)
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
Sandstone
Arenite
Blue Chalcedony
Silicon Dioxide (SiO2)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Greenstone / Metabasalt
Chlorite schist or Epidiorite
Greenstone
Protolith: Basaltic rock
Greenstone
Greenschist / Meta-basalt
Limonite Geode / Ironstone Nodule
Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)
Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)
Mixed Silicates and Sulfides (SiO2, FeS2)
Azurite Malachite (Mixed)
Azurite-Malachite; Azurite: Cu3(CO3)2(OH)2 / Malachite: Cu2CO3(OH)2
Epidote
Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Weathered, quartz-rich metamorphic rock (likely schist or gneiss)
Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining