Biotite / Black Mica
Biotite K(Mg,Fe)3AlSi3O10(F,OH)2
Category
Browse mineral like byproduct specimens identified by the Rock Identifier community.
Biotite / Black Mica
Biotite K(Mg,Fe)3AlSi3O10(F,OH)2
Rough Blue Sapphire
Corundum (Al2O3)
Blue Apatite
Apatite group (Ca5(PO4)3(F,Cl,OH))
Copper Ore (Malachite and Azurite stained rock)
Cupriferous rock containing secondary copper carbonates
Quartz Pebble
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Banded Calcite (Honey Calcite)
Calcium Carbonate (CaCO3)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Hag Stone
Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
Sandstone (Quartzose)
Arenite (primarily SiO2)
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Blue Quartz
Quartz (Silicon Dioxide) with blue inclusions (SiO2)
Basalt
Mafic Extrusive Igneous Rock
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2 with chlorite inclusions)
Geode
Crystalline Quartz (SiO2) within a nodule
Gneiss
Gneiss (High-grade regional metamorphic rock)
Turritella Fossil
Turritella (Class Gastropoda, Family Turritellidae)
Olivine (Peridot)
Olivine (Magnesium Iron Silicate, (Mg,Fe)2SiO4)
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)
Limonite (Ironstone)
Limonite (FeO(OH)·nH2O)
Amphibolite with Hornblende
Amphibole-rich Metamorphic Rock (Ca2(Mg,Fe)5Si8O22(OH)2)
Laterite
Laterite (no specific mineral formula as it's a rock type)
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with Iron Oxides
Granite Pebble
Intrusive Igneous Rock
Garnet-Bearing Gneiss
Garnetiferous Feldspathic Gneiss
Porphyritic Basalt (Flower Stone)
Basalt with Feldspar phenocrysts
Granite (Polished Pebble)
Phaneritic Plutonic Rock (primarily Orthoclase and Quartz)
Smoky Quartz on Feldspar (Granite Pegmatite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
Gneiss
Gneiss
Quartz
Silicon Dioxide (SiO2)
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
Muscovite (White Mica)
Muscovite - Potassium aluminum silicate: KAl2(AlSi3O10)(F,OH)2
Ruby
Corundum (Al2O3)
Biotite (Black Mica) in Host Rock
K(Mg,Fe)3AlSi3O10(OH,F)2
Pink Sapphire
Corundum (Al2O3) with Chromium/Iron/Titanium trace impurities
Fossilized Shark Tooth
Lamniformes (order) fossil
Quartz Pebble
Silicon Dioxide (SiO2)
Hematite (Botryoidal)
Hematite (Fe2O3)
Greenschist
Greenschist (containing Chlorite, Actinolite, and Epidote)
Orange Calcite with Siderite/Iron Oxide Coating
Calcium Carbonate (CaCO3)