Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Metamorphic And Sedimentary
Browse metamorphic and sedimentary specimens identified by the Rock Identifier community.
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Garnet (likely Almandine)
Almandine - Fe3Al2(SiO4)3
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite pebble
Metamorphic rock dominated by SiO2 (Quartz)
metamorphic
Unakite (Epidotized Granite)
Unakite; primarily composed of Epidote (Ca2(Al,Fe)3(SiO4)3(OH)), Orthoclase (KAlSi3O8), and Quartz (SiO2)
Metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Schist
Mica Schist (predominantly Muscovite or Biotite)
metamorphic
Biotite Schist
Biotite-rich Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Migmatite
Migmatite (Mixed metamorphic-igneous rock)
metamorphic
Amphibolite with Hornblende
Amphibole-rich Metamorphic Rock (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Greenschist (Greenstone)
Greenschist
metamorphic
Epidote
Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Biotite Schist
Biotite Schist (containing K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Brecciated Quartzite
Brecciated Quartzite
Metamorphic
Green Aventurine
Aventurine Quartz (SiO2 containing Fuchsite)
metamorphic
Yellow Aventurine
Quartzite (formula: SiO2 with inclusions)
metamorphic
Fuchsite in Quartz
Muscovite (KAl2(AlSi3O10)(OH)2) containing Chromium + Quartz (SiO2)
metamorphic
Rhodonite
(Mn,Fe,Mg,Ca)SiO3
mineral
Unakite
Unakite (Altered Granite)
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Ruby (Raw Corundum)
Corundum (Al2O3) with Chromium traces
mineral
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)
metamorphic
Diorite (Gneissic)
Diorite
igneous
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Quartz
Quartz (SiO₂)
Mineral
Garnet (likely Almandine, Pyrope, or a blend)
Garnet group minerals: X3Y2(SiO4)3, where X and Y represent various metal ions (e.g., Almandine: Fe3Al2(SiO4)3, Pyrope: Mg3Al2(SiO4)3)
Mineral
Quartz (likely)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Schist
Mica Schist (primarily consisting of muscovite, biotite, and quartz)
metamorphic
Epidosite (Epidote-rich rock)
Epidotalite (primarily Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Mica Schist
Mica Schist (Main mineral constituents: Muscovite/Biotite, Quartz, Feldspar)
metamorphic
Greenschist with Quartz Veining
Greenschist (commonly containing Chlorite, Actinolite, and Epidote)
metamorphic
White Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Zoisite with Ruby
Anyolite (Ca2Al3(SiO4)3(OH) with Al2O3:Cr)
metamorphic
Corundum (Sapphire/Ruby in Matrix)
Corundum (Al2O3)
mineral
Unakite
Epidotized Granite
metamorphic
Unakite
Epidotized Granite
metamorphic
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Mica in Quartz Host
Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz (SiO2)
igneous
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartzite with Chlorite/Epidote
Metamorphosed Quartzite (SiO2)
metamorphic