Shale
Lutaceous Rock (Hydrous Aluminum Silicates)
sedimentary
Category
Mineral (Silicate Variety)
Browse mineral (silicate variety) specimens identified by the Rock Identifier community.
Learn about Mineral (Silicate Variety) in the encyclopedia
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Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
sedimentary
Raw Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Jasper (Green Jasper/Heliotrope variety)
Silicon Dioxide (SiO2)
sedimentary
Agate
Cryptocrystalline quartz (SiO2)
Mineral
Amygdaloidal Rhyolite
Rhyolite (felsic volcanic rock) with amygdules
igneous
Speckled rounded stone, likely granite or granitic gneiss
Granite/granitic gneiss; primarily quartz (SiO₂), feldspar, and dark mica or amphibole
igneous
Chert Concretion (Flint)
Silicon Dioxide (SiO2)
sedimentary
Ruby (Raw Corundum)
Al2O3 (Aluminum Oxide)
mineral
Banded Gneiss
Gneiss (complex metamorphic silicate rock)
metamorphic
Pallasite Meteorite (Sliced and Polished)
Pallasite (Iron-Nickel Matrix with Olivine crystals)
mineral
Basalt with Limonite stains
Extrusive mafic igneous rock; Limonite (FeO(OH)·nH2O)
igneous
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Seraphinite
Clinochlore (Mg,Fe)5Al(AlSi3O10)(OH)8 - specific variety for Seraphinite due to its fibrous inclusions and chatoyancy.
Mineral
Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Dark metamorphic rock, likely slate or phyllite
Foliated metapelite; commonly mica-rich quartz–clay mineral assemblage
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary (microcrystalline silicate)
Red Jasper (River-worn Pebble)
Silicon Dioxide (SiO2) with Ferric Iron inclusions
sedimentary (microcrystalline silicate)
Banded Chert / Cryptocrystalline Quartz
Silicon Dioxide (SiO2)
sedimentary
Tumbled jasper (likely picture jasper or iron-rich jasper)
Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides
sedimentary
Siltstone River Rock
Siltstone (composed of silt-sized particles, silicate minerals)
sedimentary
White Marble
Recrystallized Calcite / Calcium Carbonate (CaCO3)
metamorphic
Iron-stained quartz with possible feldspar
Quartz (SiO₂), likely with limonite/goethite staining and feldspar matrix
mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Olivine
Magnesium Iron Silicate ((Mg, Fe)₂SiO₄)
mineral
Sapphire (Corundum variety)
Sapphire (Al₂O₃)
Mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
Mineral
Quartz-veined Basalt or Limestone Pebble
Quartz vein in host rock (Silicate mineral in carbonate or volcanic matrix)
sedimentary
Coprolite
Fossilized Feces
sedimentary
Brecciated jasper
Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich breccia
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Red Jasper
Silicon Dioxide (SiO2) - variety Jasper
mineral
Eudialyte
Eudialyte (Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2)
mineral
Rhodonite
Rhodonite (Mn, Fe, Mg, Ca)SiO3
mineral
Blue slag glass / industrial smelter slag
Man-made iron-rich silicate slag; composition variable, commonly Fe–Ca–Mg–Al silicates with glassy phases
mineral
Nephrite Jade
Nephrite (a variety of the Calcium magnesium iron silicate mineral series Actinolite), Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Poppy Jasper
Silicon Dioxide (SiO2) with Hematite and Iron Oxide inclusions
sedimentary
Jasper and Chalcedony Composite
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Silicon
Silicon (Si)
mineral