Crushed limestone gravel
Limestone; predominantly calcite (CaCO₃), possibly dolomitic limestone with dolomite (CaMg(CO₃)₂)
sedimentary
Category
Igneous, Metamorphic, And Sedimentary (Mixed Assemblage)
Browse igneous, metamorphic, and sedimentary (mixed assemblage) specimens identified by the Rock Identifier community.
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Quartz (Pink / Rose Quartz variant)
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Dalmatian Jasper
Microcrystalline Quartz with Arfvedsonite/Tourmaline inclusions
igneous
Pyrite
Iron sulfide (FeS2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Unakite (likely)
Epidote–pink feldspar–quartz rock; commonly termed unakite
metamorphic
Volcanic breccia or conglomeratic volcanic rock
Lithic volcanic breccia; possibly andesitic–basaltic matrix with feldspar-rich clasts
igneous
Weathered granite or granitic rock fragment
Granite; chiefly quartz, feldspar, and mica
igneous
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz with Iron Inclusions
SiO2
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Milky Quartz/White Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Crystalline Silicon Dioxide (SiO2)
gemstone
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Fragment
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon dioxide (SiO2)
Mineral
Schist (Micaceous Schist)
Micaceous schist (Mainly Muscovite/Biotite mixed with Quartz)
metamorphic
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
Rounded gravel / river pebbles
Polymictic alluvial gravel, commonly quartz-, feldspar-, and lithic-rich clasts
sedimentary
Bumblebee Jasper
Anhydrite with Sulfur, Hematite, and Orpiment (SiO2/CaSO4 mixture)
sedimentary
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Raw Specimen)
Silicon Dioxide (SiO2)
mineral
Quartz (Pink / Ferruginous)
Silicon Dioxide (SiO2)
mineral
Granite (Pink/Potassium Feldspar Granite)
Felsic Plutonic Rock (Potassium Feldspar, Quartz, Mica, and Amphibole)
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral