Sandstone (with Chert/Quartzite)
Arenite (primarily SiO2)
sedimentary
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
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Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Vesicular Basalt with Amygdaloidal Infill
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt
igneous
Coquina
Biogenic Limestone (Calcite/Aragonite base, CaCO3)
sedimentary
Shale (or Mudstone)
Clay mineral aggregate / Fine-grained siliciclastic sedimentary rock
sedimentary
Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral
Boulder Opal
Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)
Mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Grey Chalcedony (Tumbled)
Chalcedony (SiO2)
mineral
Titanium Aura Quartz (Bismuth-coated Druzy)
Silicon Dioxide (SiO2) with Titanium/Metal vapor coating
mineral
Mixed river gravel (alluvial conglomeratic sediment)
Polymictic alluvium; composition includes quartz, feldspar, chert, granite, basalt, and metamorphic rock fragments
sedimentary
Basalt
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
igneous
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Granite Pebble
Phaneritic Felsic Igneous Rock
igneous
Mica Schist
Mica Schist (contains Muscovite KAl2(AlSi3O10)(OH)2)
metamorphic
Schist (Garnet-Mica Schist)
Garnet-Mica Schist (X-Y)3Z2(SiO4)3
metamorphic
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Granite
Granite (a phaneritic intrusive igneous rock)
igneous
Painted Sandstone Cobble
Clastic Sedimentary Rock (Sandstone base)
sedimentary
Basalt and Quartz Pebble
Basalt (Igneous) and Quartzite/Quartz (SiO2) pebble
igneous and sedimentary
Chert (River Pebble)
Microcrystalline silica (SiO2)
sedimentary
Pink Granite
Plagioclase-Quartz-K-Feldspar Granite
igneous
Sandstone (Greywacke/Lithic Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Red Sandstone
Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)
sedimentary
Sandstone (with Quartz Vein/Inclusion)
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzite Pebble)
Arenite / Metamorphosed Sandstone (SiO2)
sedimentary
Mica Schist
Mica Schist (predominantly Muscovite KAl2(AlSi3O10)(OH)2 and Quartz SiO2)
metamorphic
Basalt with Iron Oxide staining
Basalt (Mafic volcanic rock)
igneous
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Schist
Mica Schist
metamorphic
Basalt
Mafic Igneous Rock
igneous
Granite
Phaneritic plutonic rock (approx. 20-60% quartz, 35-90% feldspar)
igneous
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Conglomerate (River Rock)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Ironstone (Limonitic Sandstone)
Ferruginous Sandstone (rich in Limonite: FeO(OH)·nH2O)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite and/or Biotite Schist)
metamorphic
Graphite
Graphite (Chemical Formula: C)
Mineral (Native Element)
Diorite (Spotted or Dalmatian Stone pattern)
Diorite
igneous
Flower Agate (Cherry Blossom Agate)
Chalcedony (SiO2) with Opaque Inclusions
mineral
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)
sedimentary