Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Category
Mineral Like (Natural Glass)
Browse mineral like (natural glass) specimens identified by the Rock Identifier community.
Quartzite with Sandstone/Iron staining
Metamorphic Quartzite (SiO2)
metamorphic
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
Mineral
Yellow Ocherous Siltstone (Limonitic Shale)
Limonitic Siltstone / Goethite-rich Sedimentary Rock
sedimentary
Quartz (specifically Milky or Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky to Clear)
Silicon Dioxide (SiO2)
mineral
Chert (White Variety)
Silicon Dioxide (SiO2)
sedimentary
Opalite
Synthetic Glass (Amorphized Silicon Dioxide)
mineraloid
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Quartz
Quartz (SiO₂)
Mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Dyed Dragon Vein Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Druzy Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Septarian Nodule
Septarian Concretion (CaCO3, CaMg(CO3)2, SiO2)
sedimentary
Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial colorants
Mineral (variety of Chalcedony)
Snowflake Obsidian
Spherulitic Obsidian (primarily SiO2)
igneous
Quartz (Smoky or Clear variety with inclusions)
Silicon Dioxide (SiO2)
mineral
Shungite
Shungite (Amorphous Carbon)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Black Onyx
Silicon dioxide (SiO2) - Chalcedony variety
mineral
Orthoclase Feldspar with Quartz
Orthoclase (KAlSi3O8)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2 (Calcium magnesium iron silicate hydroxide)
metamorphic
Moldavite
Moldavite (Siliceous vitreous substance)
tektite (natural glass)
Synthetic Faux Fur Fursuit
Polyacrylonitrile / Polyester (Synthetic Textile)
not a rock (synthetic material/costume)
Coquina
Bioclastic Limestone (Coquina)
sedimentary
Dyed Quartzite
Metamorphosed Quartz (SiO2) with synthetic pigment
metamorphic
Snowflake Obsidian
Hydrated Volcanic Glass (primarily SiO2) with Cristobalite inclusions
igneous
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Yellow Ochre / Limonite
Hydrated ferric oxide (FeO(OH)·nH2O)
mineral
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (SiO2 primary composition)
sedimentary
Citrine Quartz
Citrine (Silicon Dioxide - SiO2)
Mineral
Porphyritic Basalt
Porphyritic Basalt (containing Plagioclase or Alkali Feldspar phenocrysts)
igneous
Fossilized Bored Limestone
Limestone with Ichnofossils (Gastrochaenolites or Entobia)
sedimentary
Shale with Plant Fossils / Carbonaceous Shale
Laminated Mudrock (Siliciclastic)
sedimentary
Milky Quartz with inclusions
Silicon Dioxide (SiO2)
mineral