Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Mineral Like (Natural Glass)
Browse mineral like (natural glass) specimens identified by the Rock Identifier community.
Learn about Mineral Like (Natural Glass) in the encyclopedia
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White Sapphire
Corundum (Al2O3)
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Feldspar
Triclinic or Monoclinic Tectosilicate (e.g., KAlSi3O8)
mineral
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Anthropogenic (Man-made)
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone Pebble (River Rock)
Sandstone (Quartz-rich sedimentary rock with iron oxide staining)
sedimentary
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Sandstone (Nut-stone / Cup-stone artifact)
Quartz Arenite / Worked Sedimentary Rock
sedimentary
Polished Black Obsidian
Volcanic Glass (70-75% SiO2)
igneous
Dyed Blue Agate Druzy Pendant
Quartz / Chalcedony (SiO2) with artificial color treatment
gemstone
Granite
Felsic Plutonic Igneous Rock
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Potassium Feldspar
K-Feldspar (KAlSi3O8)
mineral
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Quartz (Smoky/Granular variety)
Silicon Dioxide (SiO2)
mineral
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Obsidian
Amorphous volcanic glass (SiO2)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (high K-feldspar)
igneous
Quartz (Iris / Rainbow Quartz)
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)
Silicon Dioxide (SiO2) with inclusions/dye
gemstone
Quartz Pebble (Iron-Stained)
Quartz (Silicon Dioxide - SiO2)
mineral
Black Onyx
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)
Silicon Dioxide (SiO2) with metallic inclusions
man-made material
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Porphyritic Basalt
Porphyritic Basalt (containing Plagioclase or Alkali Feldspar phenocrysts)
igneous
Tumbled jasper, likely red jasper
Microcrystalline quartz (SiO₂), chalcedony variety with iron-oxide impurities
mineral
Tumbled Citrine
Silicon Dioxide (Quartz variety)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
mineral
Azurite-Malachite (often called Azerite Malachite or Azurmalachite)
Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2CO3(OH)2)
Mineral
Quartz (Variety of Rough Mineral Specimens)
Silicon Dioxide (SiO2)
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Shark Tooth Fossil
Vertebrate fossilized tooth
fossil
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Amethyst (Carved Wolf Mini Figurine)
Silicon Dioxide (SiO2)
gemstone
Dyed Quartzite
Metamorphosed Quartz (SiO2) with synthetic pigment
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous