Jasper
Microcrystalline Quartz (SiO2)
gemstone
Category
Sedimentary (Microcrystalline Silicate)
Browse sedimentary (microcrystalline silicate) specimens identified by the Rock Identifier community.
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Polished ocean jasper (orbicular jasper), probable
Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions
mineral
Purple Chalcedony
Silicon Dioxide (SiO2)
mineral
Iron Slag
Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)
Anthropogenic (Man-made industrial byproduct)
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Banded Jasper (Mookaite / Chert)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Polished Nephrite Jade
Calcium magnesium iron silicate hydroxide - Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Lazulite
Lazulite (MgAl2(PO4)2(OH)2)
mineral
Green-and-white quartz-rich rock, likely chrysoprase or serpentine-bearing stone
Uncertain; possible chrysoprase (microcrystalline quartz, SiO₂) or serpentinite (magnesium silicate minerals)
mineral
Serpentinite
Serpentinite (complex silicate mineral group (Mg,Fe)3Si2O5(OH)4)
metamorphic
Chert (Common Opal or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Assorted Tumbled Gemstones
Mixed oxides and silicates (including Quartz, Chalcedony, and Feldspar variants)
mineral
Red Jasper and Hematite
Silicon Dioxide (SiO2) and Iron Oxide (Fe2O3)
mineral
Jasper (Iron-rich)
Silicon Dioxide (SiO2) with Fe2O3 (Hematite) impurities
sedimentary
Yellow Chalcedony (Carnelian / Agate Pebbles)
Silicon Dioxide (SiO2)
mineral
Red Jasper (Polished Point Pendant)
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
mineral
Jasper
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Jasper with Quartz Vein
Microcrystalline quartz (SiO2) with impurities
sedimentary
Chert Pebble (with Quartz Vein)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood / Fossilized Bone
Silicified / Mineralized Fossil (Silica SiO2)
fossil
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Mixed Tumbled Stones Collection
Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)
multiple
Chert (Jasper / Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2)
mineral
Unidentified weathered rock fragments
Likely mixed silicate rocks; specific identification requires testing
mineral
Yellow Chalcedony / Carnelian
Silicon Dioxide (SiO2)
mineral
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
metamorphic
Quartz-veined Basalt or Limestone Pebble
Quartz vein in host rock (Silicate mineral in carbonate or volcanic matrix)
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chrysocolla
Hydrated copper silicates (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Small rounded pebble, likely quartz-rich stone
Indeterminate from photograph; possibly microcrystalline quartz (SiO₂) or a weathered silicate pebble
mineral
Jasper
Silicon dioxide (Quartz variety), SiO2
sedimentary
Graphite-rich schist (likely graphite ore)
Graphite-bearing schist; predominantly graphitic carbon (C) with mica, quartz, and possible feldspar
metamorphic
Red Jasper (or Banded Jasper)
Silicon Dioxide (SiO2 with Hematite impurities)
mineral