Granite
Phaneritic plutonic rock (SiO2 + Al2O3 + K2O + Na2O + CaO)
igneous
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
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Quartz with Hematite Inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with inclusions of Iron Oxide
mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)
mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Bloodstone
Heliotrope (Chalcedony)
mineral
Shale
Shale (Consolidated fine-grained clay/silt)
sedimentary
Basalt with Plagioclase Microphenocrysts
Amygdaloidal or Porphyritic Basalt
igneous
Peach Selenite
Gypsum (CaSO4·2H2O)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore/Sandstone mixture)
Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix
mineral
Porphyritic Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Greenstone (Celadonite-bearing Volcanic)
Hydrothermally altered basalt or andesite with Celadonite (K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2)
metamorphic
Basalt (Weathered)
Basalt
igneous
Chalcedony with Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Chalcedony with Matrix
Silicon Dioxide (SiO2)
mineral
Citrine Geode Fragment
Citrine (Silicon Dioxide with Iron Impurities), SiO2
mineral
Quartz Mica Schist
Mica-Quartz Schist (Chemical: SiO2 + KAl2(AlSi3O10)(OH)2)
metamorphic
Granite
Granite
igneous
Snowflake Obsidian
Spherulitic Volcanic Glass (SiO2 + impurities)
igneous
Mica Schist
Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Dendritic Siltstone
Siltstone with Manganese Dendrites (MnO2)
sedimentary
Basalt
Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)
igneous
Leopard Skin Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Fossilized Shark Tooth (Drum Fish Tooth/Pavement Tooth)
Sparidae or Sciaenidae (Crushing plate dental fossil)
fossil
Smooth gray river pebble
Likely fine-grained sandstone or siltstone; exact identification requires a fresh surface and tests
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide Fe2O3 cement)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Diorite
Intermediate Phaneritic Plutonic Rock - Diorite
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Porphyritic Basalt (likely artificially dyed or altered)
Basalt with plagioclase phenocrysts (likely treated)
igneous
Banded Agate
Silicon Dioxide (SiO2) - Chalcedony Variety
mineral
Dendritic Agate / Chalcedony
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Cubic Zirconia (CZ) Jewelry
Zirconium dioxide (ZrO2)
mineral (synthetic)
Moss Agate
Silicon Dioxide with inclusions (SiO2 + impurities)
mineral
Fuchsite
Chromian Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral