Chert / Jasper / Agate (Chalcedony Group)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mineral (Silicate Variety)
Browse mineral (silicate variety) specimens identified by the Rock Identifier community.
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Green Calcite
Calcium Carbonate (CaCO3)
mineral
Granite
Intrusive Igneous Rock
igneous
Aquamarine (Beryl) Beads
Beryllium aluminum silicate (Be3Al2Si6O18)
gemstone
Copper-stained rounded stone
Likely copper-bearing chrysocolla or azurite/malachite coating on a silicate host; exact identification requires testing
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Tektite
Natural impact glass
meteorite
Potassium Feldspar (Orthoclase / Microcline)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Beryl (var. Aquamarine/Blue Beryl) in Quartz Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Rough White Zircon
Zircon (Zirconium Silicate, ZrSiO4)
mineral
Aquamarine (Beryl)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Aquamarine (Beryl)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Slag
Anthropogenic Iron Silicate Glass
mineral
White Moonstone (Scolicite or White Feldspar var. )
Lattice-structure Silicate (KAlSi3O8)
mineral
Beryl (likely Emerald or Aquamarine in matrix)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Orthoclase Feldspar
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Aquamarine
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
White Zircon
Zircon (Zirconium silicate, ZrSiO4)
mineral
Beryl in Quartz Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Peach Moonstone Sphere
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Beryl (likely var. Aquamarine or Goshenite) in Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Greyscale Moonstone / Silver Sheen Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Limonite (Iron Ore)
Limonite (unstructured hydrated iron(III) oxide-hydroxides, often FeO(OH)·nH2O)
mineral
Small rounded stone or mineral fragment
Indeterminate; likely a common quartz- or feldspar-bearing silicate fragment
mineral
Gastropod Fossil
Class Gastropoda (fossilized)
fossil
Biotite (Mica)
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Aquamarine (Beryl)
Beryllium Aluminum Silicate - Be3Al2Si6O18
gemstone
Amazonite (Microcline Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Amazonite
Potassium aluminum silicate (KAlSi3O8)
mineral
Polished brown mineral or rock fragment
Indeterminate from image; possibly iron-stained quartz, jasper, or a polished sulfide-bearing specimen
mineral
Sandstone
Arenite
sedimentary
Pink Quartz (Rose Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Topaz
Al2SiO4(F,OH)2
mineral
Quartz with Mica (Muscovite/Biotite)
Silicon Dioxide (SiO2) with Phyllosilicate inclusions
mineral
Ruby in Kyanite
Corundum in Disthene (Al2SiO5 + Al2O3)
metamorphic
Green Aventurine
SiO2 (Quartz with Fuchsite inclusions)
mineral
Quartz–feldspar–mica metamorphic rock, likely gneiss
Gneiss; composition commonly quartz (SiO₂), feldspars, biotite/hornblende, and minor accessory minerals
metamorphic
Mixed River Pebbles (Jasper, Hematite, and Quartzites)
Silicon dioxide (Jasper/Quartz) and Iron oxide (Hematite)
sedimentary
Tree Agate
Silicon Dioxide (SiO2) with Chlorite inclusions
mineral
Leopard Skin Jasper
Silicon Dioxide (SiO2) with iron and manganese inclusions
sedimentary