Mixed Tumbled Stones (Mostly Agate, Jasper, and Quartz)
Silicon Dioxide (SiO2)
sedimentary and metamorphic minerals
Category
Metamorphic Or Sedimentary Depending On Local Grade
Browse metamorphic or sedimentary depending on local grade specimens identified by the Rock Identifier community.
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Quartz (likely a clear or rock crystal variety)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Tanzanite (Blue Zoisite)
Ca2Al3(SiO4)(Si2O7)O(OH) + (V) - Vanadium-bearing Zoisite
mineral
Schist
Mica Schist
metamorphic
Yellow Sapphire or Citrine
Al2O3 (Corundum) or SiO2 (Quartz)
mineral
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Gneiss
Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)
metamorphic
Schist
Schist
Metamorphic
Milky Quartz
Quartz (Silica / Silicon Dioxide), SiO2
mineral
Diamond
Diamond (pure carbon C)
mineral
Greenstone
Chlorite schist or Epidosite
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Anthracite Coal
Anthracite (Carbon Content: 86%-97%)
metamorphic
Diamond
Native Carbon (C)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 with Au)
mineral
Diamond (Princess Cut Faceted Gemstone)
Native Carbon (C)
mineral
Gold Ore (in Quartz/Sulfide matrix)
Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)
mineral
Ruby
Corundum (Al2O3 with chromium impurities)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Rough Quartz in Pegmatite Matrix
Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite
igneous
Biotite Schist
Biotite-rich Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Amphibolite with Hornblende
Amphibole-rich Metamorphic Rock (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Anthracite Coal
Anthracite
metamorphic
Sandstone
Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)
Sedimentary Rock
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
Mineral
Epidote
Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))
mineral
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary
Aventurine (Green)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Greenschist
Greenschist facies rock (containing chlorite, actinolite, and epidote)
metamorphic
Anthracite Coal with Sulfur staining
Anthracite (Carbon C with impurities)
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Biotite)
metamorphic
Tiger Iron
Banded Iron Formation (BIF)
sedimentary
Biotite (Black Mica) in Host Rock
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Iron Ore (Magnetite-Hematite)
Magnetite (Fe3O4) and Hematite (Fe2O3)
mineral
Eclogite
Eclogite (Pyrope garnet and Omphacite pyroxene)
metamorphic
Emerald
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Quartz (likely) or a Quartzite Pebble
Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.
Mineral, specifically a detrital grain
Greenschist
Greenschist (Chlorite Schist)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic