Emerald (or possibly Green Glass / Slag)
Beryl (Be3Al2(SiO3)6)
gemstone
Category
Mineral, Often Found As A Rock (Metamorphic)
Browse mineral, often found as a rock (metamorphic) specimens identified by the Rock Identifier community.
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Limonite/Goethite Concretion
Hydrated Iron(III) Oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Malachite
Copper carbonate hydroxide, Cu2CO3(OH)2
mineral
Epidote
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Sapphire (Rough Corundum)
Corundum (Aluminum Oxide, Al2O3)
mineral
Auriferous Quartz (Gold-bearing Quartz)
Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Sandstone (Micaceous)
Clastic Sedimentary Rock (primarily SiO2 with Mica)
sedimentary
Quartzite river stone
Quartzite (SiO2)
metamorphic
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (potentially Flint or Mudstone)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Sapphire
Corundum (Al2O3)
mineral
Green Fuchsite and Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Chalcedony (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Ironstone / Hematite Concretion
Iron oxide / Fe2O3
sedimentary
Gneiss
Foliated Metamorphic Rock
metamorphic
Clear Quartz (Faceted)
Silicon Dioxide (SiO2)
gemstone
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Rough Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Granitic Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Chalcanthite
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Banded Metamorphic Rock
Gneiss or Schist
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Chalcedony (Agate/Carnelian pebbles)
Cryptocrystalline Quartz (SiO2)
mineral
Rough garnet-bearing rock, likely almandine garnet in matrix
Almandine garnet, Fe₃Al₂(SiO₄)₃; exact host rock cannot be determined from the image
metamorphic
Carnelian
Carnelian (SiO2)
mineral
Chert (often called Flint or Jasper)
Microcrystalline quartz (SiO2)
sedimentary
Chert (White/Gray variety)
Silicon Dioxide (SiO2 / Cryptocrystalline Quartz)
sedimentary
Gneiss with Quartz Vein
Metamorphic Gneiss
metamorphic
Jasper (Green)
Silicon dioxide (SiO2)
Mineral/Sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Vein in Amphibolite / Gneiss
Quartz (SiO2) in Mafic Metamorphic Host Rock
metamorphic
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral