Schist with Biotite and Quartz
Biotite-Quartz Schist (Fe,Mg,Al silicate mix)
metamorphic
Category
Mineral Like Byproduct (Technogenic)
Browse mineral like byproduct (technogenic) specimens identified by the Rock Identifier community.
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Felted Quartz / Chlorite Quartz
Chlorite included Quartz (SiO2 + (Mg,Fe)3(Si,Al)2O5(OH)4)
mineral
Quartzite with Hematite staining
Quartzite (SiO2) with iron oxide inclusions
metamorphic
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Copper Ore (with Malachite/Chrysocolla and Iron Oxides)
Secondary Copper Minerals (Cu2(CO3)(OH)2 / (Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Dalmatian Stone
Peralkaline igneous rock containing quartz, feldspar, and arfvedsonite
igneous
Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Fossilized Coral (Petoskey Stone type)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Limonite (Iron Ore)
Hydrated ferric oxide (FeO(OH)·nH2O)
sedimentary
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Limonite (Iron Stone/Gossen)
Limonite (FeO(OH)·nH2O)
mineral
Schist
Crystalline Schist (often containing Muscovite, Biotte, or Quartz)
metamorphic
Gneiss
Gneiss
metamorphic
Geode
Quartz / Chalcedony nodule with mineralized cavity
sedimentary
Vesicular Basalt
Mafic Volcanic Rock (Basalt)
igneous
Sandstone Concretion
Carbonate-cemented Sandstone Concretion
sedimentary
Mica (Muscovite or Biotite)
Sheet silicate mineral group (e.g., KAl2(AlSi3O10)(F,OH)2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Silver
Ag (Native Silver)
mineral
Inclusion Quartz (Garden Quartz)
Silicon Dioxide (SiO2) with inclusions (e.g., Chlorite, Hematite)
mineral
Sandstone
Arenite (mainly SiO2 with varying cements)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Azurite with Malachite
Azurite: Cu3(CO3)2(OH)2 / Malachite: Cu2CO3(OH)2
mineral
Chert (and Petrified Wood)
Silicon Dioxide (SiO2)
sedimentary
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Fe2O3 staining)
sedimentary
Chert (variations include Flint/Chalcedony)
Chert (SiO2 - Silicon Dioxide)
sedimentary
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Amazonite
Microcline (KAlSi3O8)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Orthoclase Feldspar
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Diorite
Diorite (Intermediate plutonic rock)
igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Greenstone / Greenschist
Greenschist (contains chlorite, epidote, actinolite)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral