Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Category
Man Made Byproduct (Often Mistaken For Obsidian Or Emerald)
Browse man made byproduct (often mistaken for obsidian or emerald) specimens identified by the Rock Identifier community.
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Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Quartzite
Quartzite
metamorphic
Diamond
Carbon (C)
mineral
Chert (with Manganese Dendrites)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Silver Nuggets (Natural or Cast)
Native Silver (Ag)
mineral
Quartzite
Silicon Dioxide (SiO2)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Ironstone Concretion (Coprolite-like)
Goethite/Hematite Siderite Spheroid (FeCO3 or FeO(OH))
sedimentary
Quartzite
Quartzite (Metamorphic Quartz Sandstone)
metamorphic
Emerald
Beryl (Be₃Al₂(SiO₃)₆) with Chromium or Vanadium impurities
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Pink Marble
Recrystallized Limestone (Calcium Carbonate, CaCO3)
metamorphic
Jasper with Manganese Dendrites
Silicon Dioxide (SiO2) with Oxide Mineral Inclusions
sedimentary
Pink Orthoclase Feldspar with Dendrites
Orthoclase (KAlSi3O8) with Manganese Oxide dendrites
mineral
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Dendritic Agate (Tumbled)
Silicon Dioxide (SiO2) with inclusions
mineral
Anthracite Coal with Sulfur staining
Anthracite (Carbon C with impurities)
metamorphic
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Mineral
Sandstone with Dendritic Manganese Oxides
Sandstone (SiO2 predominant) with Oxide Dendrites (MnO2)
sedimentary
Diamond
Native Carbon (C)
gemstone
Blue Dumortierite Quartz
AlAl6BSi3O18 (Dumortierite) within SiO2 (Quartz)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Greenstone
Greenschist (composed of actinolite, chlorite, and epidote)
metamorphic
Sandstone
Arenite
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Sea Glass
Silicon dioxide (mostly)
mineral
Bismuth
Bismuth (element Bi) with oxidized thin-film interference layer
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Jade (likely Jadeite or Nephrite)
Jadeite (NaAlSi2O6) or Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral/Mineraloid
Rough Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Chert (varieties: Flint or Jasper)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic