Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Category
Sedimentary (Microcrystalline Silicate)
Browse sedimentary (microcrystalline silicate) specimens identified by the Rock Identifier community.
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Red Jasper (Polished Point Pendant)
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
mineral
Yellow Chalcedony (Carnelian / Agate Pebbles)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Assorted Tumbled Gemstones
Mixed oxides and silicates (including Quartz, Chalcedony, and Feldspar variants)
mineral
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
metamorphic
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Common Opal or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz-bearing metamorphic rock, possibly quartzite or hornfels
Mostly quartz (SiO₂), with probable iron-oxide and dark silicate minerals
metamorphic
Chert (Basanite / Jasperoid)
Microcrystalline Quartz (SiO2)
sedimentary
Polished ocean jasper (orbicular jasper), probable
Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert with Quartz Veins
Microcrystalline silica (SiO2)
sedimentary
Asphalt aggregate
Human-made bituminous asphalt containing crushed silicate rock aggregate
sedimentary
Weathered limestone or concrete-like calcareous rock
Limestone; predominantly calcite (CaCO₃), possibly containing dolomite and silicate impurities
sedimentary
Quartz-veined Basalt or Limestone Pebble
Quartz vein in host rock (Silicate mineral in carbonate or volcanic matrix)
sedimentary
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon dioxide (Quartz variety), SiO2
sedimentary
Jasper Pebble
SiO2 (Microcrystalline Quartz)
sedimentary
Unidentified weathered rock fragments
Likely mixed silicate rocks; specific identification requires testing
mineral
Chert / Flint (or lithic artifact flake)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Pebble with Quartz Vein
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper (or Banded Jasper)
Silicon Dioxide (SiO2 with Hematite impurities)
mineral
Jasper
Silicon Dioxide (SiO2)
mineral
Chert Pebble (with Quartz Vein)
Silicon Dioxide (SiO2)
sedimentary
Jasper with Quartz Vein
Microcrystalline quartz (SiO2) with impurities
sedimentary
Polished brecciated jasper (likely picture jasper)
Silica-rich microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and clay inclusions
metamorphic
Red Chert / Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Rhodolite Garnet
Magnesium Aluminum Silicate; formula: (Mg,Fe)3Al2(SiO4)3
mineral
Tumbled orbicular jasper
Orbicular jasper, chiefly microcrystalline quartz (SiO₂) with iron oxides and other silicates
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Mixed Tumbled Stones Collection
Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)
multiple
Polished leopard-skin jasper
Leopard-skin jasper; an opaque, microcrystalline quartz-rich rock, commonly with iron-oxide and volcanic/mineral inclusions
metamorphic
Brecciated Jasper (Polished)
Silicon Dioxide (SiO2) with Iron Oxide Impurities
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2)
gemstone
Carnelian Agate
Silicon Dioxide (Chalcedony variety)
mineral
Leopard Skin Jasper
Microcrystalline Quartz (SiO2) with mineral impurities
sedimentary
Chert (Flint)
Microcrystalline silica (SiO2)
sedimentary