River Stone (River Pebble)
River Stone (Composition: primarily Quartzite, Chalcedony, and silicate minerals)
sedimentary
Category
Mineral (Silicate Replaced Organic Material)
Browse mineral (silicate replaced organic material) specimens identified by the Rock Identifier community.
Learn about Mineral (Silicate Replaced Organic Material) in the encyclopedia
View all →
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Sandstone/Quartzite
Sedimentary Rock (composed mainly of SiO2)
sedimentary
Falcon's Eye (Blue Tiger's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Amber
Succinates (Organic Gemstone)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Yellow Diamond
Diamond (Carbon, C)
mineral
Blue Sapphire
Corundum (Al2O3 with trace Titanium/Iron)
mineral
Vuggy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Tiger's Eye and Hematite
Quartz (SiO2) with Crocidolite inclusions and Hematite (Fe2O3)
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Calcareous or Ferruginous)
Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Basalt with Quartz/Calcite Inclusions
Mafic Volcanic Rock (Fe-Mg silicate rich)
igneous
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Limonite (Iron Ore)
Limonite (mixture of hydrated iron(III) oxide-hydroxides)
Mineral
Chert with Iron Oxide Staining
Microcrystalline Quartz (SiO2) with Limonite/Goethite staining
sedimentary
Eagle Eye Stone (Gray-Blue Tiger's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Chert
Chert (variant of microcrystalline quartz)
Sedimentary
Tiger's Eye
SiO2 (Pseudomorph of Quartz after Crocidolite)
metamorphic
Red Sandstone
Arenite (primarily Quartz with Iron Oxide coating)
sedimentary
Amber
Succinite (fossilized tree resin)
fossil
Amber
Succinite (C10H16O)
Mineraloid
Amber
Succinite (Resinite)
Organic Crystal (Mineraloid)
Amber
Succinite (a specific common type) or Fossilized Tree Resin (C10H16O)
Mineraloid
Copper-bearing Quartz (with Malachite and Iron Oxides)
Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)
Mineral Specimen
Biotite on Matrix
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Amethyst Quartz
Silicon Dioxide (SiO2)
mineral
Nephrite Jade
Nephrite (Silicate mineral: Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Red Sandstone (Iron-rich)
Arenite (with Hematite cement)
sedimentary
Chert (Arrowhead Preform or Flake)
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate and Hematite
Silica (SiO2) with fibrous inclusions of Manganese or Iron; Hematite (Fe2O3)
mineral
Ironstone Concretion
Goethite-rich Siltstone / Siderite (FeCO3)
sedimentary
Amber
Succinite (fossilized resin); C10H16O
mineraloid
Garnet
Garnet Group (Silicate Minerals), formula varies e.g., Alm: Fe3Al2(SiO4)3
mineral
Chert (Green Chert)
Microcrystalline silica (SiO2)
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz River Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Yellow Diamond (Faceted)
Diamond (C - Pure Carbon)
mineral
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral