Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Category
Metamorphic (Localized) Or Sedimentary
Browse metamorphic (localized) or sedimentary specimens identified by the Rock Identifier community.
Learn about Metamorphic (Localized) Or Sedimentary in the encyclopedia
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Honey-colored quartz cluster
Quartz, silicon dioxide (SiO₂), likely iron-stained or included quartz
mineral
Garnet (Almandine)
Almandine, Fe3Al2Si3O12
mineral
Milky Quartz
Silicon dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite in Quartz Matrix
Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartzite with Mica / Gneiss Pebble
Metamorphic Rock (Quartz-Feldspar-Mica aggregate)
metamorphic
Garnet in Schist (Mica Schist with Garnet Inclusion)
Garnetiferous Mica Schist (X3Al2(SiO4)3)
metamorphic
Biotite-bearing gneiss
Feldspar–quartz gneiss with dark biotite or amphibole-rich band
metamorphic
Likely banded gneiss
Gneiss, a foliated metamorphic rock composed chiefly of quartz, feldspar, and mica
metamorphic
Small weathered mineral/rock fragment
Indeterminate; possibly quartz-bearing feldspathic rock or calcite-rich specimen
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Fluorite, Turquoise, and Calcite set
Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Green Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Amber (likely a small rough amber piece)
Fossilized plant resin; amber is an organic mineraloid, not a crystalline mineral
gemstone
Weathered schist or phyllite
Mica schist/phyllite, likely quartz–mica-rich metamorphic rock
metamorphic
Gneiss
Metamorphic Gneiss
metamorphic
Green Gneiss
Metamorphic Gneiss
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Banded gneissic rock
Gneiss, likely quartz–feldspar–biotite gneiss
metamorphic
Banded Gneiss
Metamorphic Gneiss
metamorphic
Blue Apatite
Calcium phosphate mineral, Ca5(PO4)3(F,Cl,OH)
mineral
Specular Hematite
Specularite (Fe2O3)
mineral
Gneiss (River Cobble)
Metamorphic Gneiss
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz-rich pebble
Mostly quartz (SiO₂), possibly a quartzite or vein-quartz fragment
mineral
Slate
Slate; fine-grained foliated metamorphic rock, commonly derived from shale or mudstone
metamorphic
Rounded gray river pebble, likely fine-grained basalt or andesite
Basaltic-andesitic volcanic rock; commonly plagioclase feldspar, pyroxene, and minor iron oxides
igneous
Pink-and-black gneiss
Foliated granitic gneiss, commonly quartz–feldspar–biotite gneiss
metamorphic
Tiger Iron
Tiger Iron (Hematite, Red Jasper, and Tiger's Eye)
metamorphic
Quartz
SiO2 (Silicon Dioxide)
mineral
Quartz
Silicon dioxide (SiO2)
mineral
Quartz
SiO2 (Silicon Dioxide)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Tiger's Eye, Hematite, and Black Obsidian Bracelet
SiO2 (Tiger's Eye), Fe2O3 (Hematite), and 70-75% SiO2 (Obsidian)
mineral
Quartz Crystal Cluster / Quartzite
Silicon Dioxide (SiO2)
mineral