Red Sandstone
Arenite (primarily composed of SiO2 with Fe2O3 cement)
sedimentary
Category
Man Made Metamorphic Style Composite
Browse man made metamorphic style composite specimens identified by the Rock Identifier community.
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Red Sandstone
Sedimentary Arenite / Quartzose Sandstone
sedimentary
Leopard Skin Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Granite
Granite (composed primarily of Quartz, Plagioclase, Alkali Feldspar, and Mica)
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Granite (Phaneritic intrusive igneous rock; primarily SiO2 and Al2O3)
igneous
Sandstone (Quartz-rich)
Arenite
sedimentary
Rhodonite
Inosilicate, (Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Glacial granite/granitoid boulder
Granite to granodiorite; chiefly quartz, feldspar, and biotite/hornblende
igneous
Quartz (clear quartz/crystal quartz)
Quartz, silicon dioxide (SiO₂), trigonal crystal system
mineral
Native Silver
Silver (Ag)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Granite
Granite (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite (Fine-grained)
Phaneritic Felsic Igneous Rock
igneous
Pink Granite
Granite (Phaneritic Acid Igneous Rock)
igneous
Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Mineral in Igneous Rock
Gemstone bead necklace (likely citrine or yellow quartz)
Quartz, SiO₂; precise identification is uncertain because the beads are blurred and metal settings obscure them
gemstone
Sugilite
Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)
mineral
Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation
SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)
mineral
K-Feldspar (Potassium Feldspar / Pink Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Weathered Sandstone / Quartzite
Quartz Arenite
sedimentary
Limestone
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Gabbro
Phaneritic mafic intrusive igneous rock
igneous
Granite
Phaneritic plutonic igneous rock (mostly SiO2 and Al2O3)
igneous
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Vesicular Basalt
Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)
igneous
Bort or Carbonado
C - Polycrystalline Diamond
mineral
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Coarse Sandstone
Arenite (SiO2 based)
sedimentary
Granite
Phaneritic intrusive igneous rock (approx. 70 percent SiO2)
igneous
Vesicular Basalt with Quartz/Chalcedony
Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Likely hematite-rich ironstone or metallic mineral fragment
Hematite (Fe₂O₃), possibly with magnetite (Fe₃O₄) or metallic iron
mineral
Slate
Low-grade Metamorphic Rock (composed of quartz, illite, chlorite)
metamorphic
Gneiss (specifically Biotite Gneiss)
Gneiss (high-grade metamorphic rock primarily composed of Silicates)
metamorphic
Gneiss (Stream-worn Cobble)
Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica)
metamorphic