Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Category
Synthetic Or Natural Fiber
Browse synthetic or natural fiber specimens identified by the Rock Identifier community.
Learn about Synthetic Or Natural Fiber in the encyclopedia
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Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Sandstone (Stream-rounded Cobble)
Arenite (composed primarily of SiO2, Silica)
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2)
mineral
Citrine (likely Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Dyed Purple Agate Sliced
Silicon Dioxide (SiO2) with artificial pigment
mineral
Titanium Amethyst Geode
Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer
mineral
Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Granite
Granite (Mainly Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Diamond
Native Carbon (C)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide - SiO2)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Phaneritic Plutonic Felsic Rock
igneous
Smoky Quartz (Polished)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Red Jade (Dyed Quartzite)
Silicon Dioxide (SiO2) - variety Quartzite
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with impurities of iron)
mineral
Pearl
Calcium carbonate (CaCO3) in the form of aragonite or calcite
mineral
Concrete with Exposed Aggregate
Anthropogenic conglomerate (Concrete)
man-made rock (sedimentary analogue)
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Limonite pseudomorph after Pyrite
Goethite/Limonite FeO(OH)·nH2O
mineral
Fairy Stone (Staurolite)
Staurolite (Fe2+2Al9Si4O22(OH)2)
mineral
Quartzite (River Pebbles)
Metamorphosed Sandstone (SiO2)
metamorphic
Dyed Howlite (Dyed Red)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic plutonic rock (dominated by Quartz, Feldspar, and Mica)
igneous
Blue Chalcedony (likely dyed Agate)
Silicon Dioxide (SiO₂)
mineral
Pumice
Pumice (Vesicular volcanic glass)
igneous
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Man-made Metal Pin (Non-geological)
Antimony-Lead Alloy or Zinc/Brass Base with Electroplating
Metal Alloy / Manufactured Artifact
Smoky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Sandstone with Iron Staining
Arenite (SiO2 with Fe2O3)
sedimentary
Amber (Cherry or Red variety)
Succinite (with various trace amounts of organic compounds)
Organic Gemstone (not a rock)
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral