Serpentine
Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4
metamorphic
Category
Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)
Browse industrial byproduct (often mistaken for obsidian or mineral) specimens identified by the Rock Identifier community.
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Aventurine Quartz
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Siltstone
Siltstone (composed of clastic quartz and feldspar)
sedimentary
Dalmatian Stone
Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt with Fusion Crust (Meteorite-like appearance)
Vesicular Basalt
igneous
Green Aventurine (Quartz)
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Green Fuchsite in Quartz (sometimes called Green Aventurine)
Fuchsite (Chrome-rich Muscovite) K(Al,Cr)2(AlSi3O10)(OH)2 in Quartz SiO2
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Obsidian with Spherulitic Devitrification (Snowflake Obsidian/Mahogany related)
Volcanic Glass (70% or more SiO2)
igneous
Quartzite (Ferruginous)
Metamorphosed Quartz Sandstone (SiO2 with Iron oxide staining)
metamorphic
Pumice
Pumicite (Amorphous glass with varying chemical composition, often rhyolitic)
Igneous
Mica in Quartz Host
Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz (SiO2)
igneous
Diamond (Martapura/Borneo Diamond)
Carbon (C) - Diamond
mineral
Native Copper in Basalt
Amygdaloidal Basalt with Native Copper (Cu)
metamorphic
Garnetiferous Quartzite (Garnet Gneiss Pebble)
Garnet-bearing Quartzite or Quartz-Feldspar Gneiss
metamorphic
Auriferous Quartz with Pyrite
Gold-bearing Quartz (SiO2 + FeS2 + Au)
mineral
Gold Sheen Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Quartz with Iron Oxide Inclusions
SiO2 with Fe2O3 impurities
Mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Quartz with Muscovite Mica
SiO2 with KAl2(AlSi3O10)(OH)2
mineral group
Copper Ore (likely Malachite or Chrysocolla staining)
Copper Secondary Mineral (e.g., Cu2CO3(OH)2)
mineral
Arsenopyrite in Quartz/Host Rock
Arsenopyrite (FeAsS)
mineral
Rhyolite
Rhyolite (High-silica volcanic rock)
igneous
Diamond (set in jewelry)
Carbon (C)
mineral
Tektite
Tektite (high-silica natural glass)
Mineraloid
Talc (Soapstone variety)
Talc (Hydrated magnesium silicate) - Mg3Si4O10(OH)2
mineral
Tektite (Indochinite)
Tektite (High-silica natural glass)
igneous
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral
Iolite (Cordierite)
Cordierite (Magnesium iron aluminum cyclosilicate), Mg2Al4Si5O18
metamorphic
Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
mineral
Black Obsidian
Volcanic Glass (SiO2 + impurities like Fe3O4)
igneous
Snowflake Obsidian
Spherulitic Obsidian (Amorphous volcanic glass with Phenocrysts of Cristobalite)
igneous
Quartzite
Quartzite (SiO2-dominant rock)
metamorphic
Bornite (Peacock Ore)
Bornite (Copper iron sulfide - Cu5FeS4)
mineral
Obsidian (Apache Tear)
Obsidian / Amorphous Volcanic Glass (main component: SiO2)
igneous
Black Dolomite
Bituminous Dolomite (CaMg(CO3)2)
sedimentary
Quartzite (River Pebble)
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Scoria
Vesicular Basalt / Scoriaceous Basalt
igneous