Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Category
Mineralological Variety
Browse mineralological variety specimens identified by the Rock Identifier community.
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Jasper (Banded Argillite/Chert mix)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Banded Calcite (often commercially sold as Mexican Onyx or Green Onyx)
Calcium Carbonate (CaCO3)
sedimentary
Rainbow Moonstone with Black Tourmaline
White Labradorite (Feldspar variety, (Na,Ca)(Al,Si)4O8) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Agate
Silicon dioxide (SiO2)
gemstone
Blue Lace Agate (or similar Chalcedony)
SiO2 (Silicon Dioxide)
mineral
Quartz crystal cluster
Quartz (silicon dioxide, SiO₂)
mineral
Chiastolite
Andalusite variety Chiastolite
mineral
Carnelian
SiO2 (Variety of Chalcedony)
gemstone
Carnelian
SiO2 (Quartz variety)
gemstone
Sunstone
Oligoclase (Feldspar variety)
mineral
Aventurine
Quartz (Aventurine variety)
Mineral
Blue Tiger's Eye
Riebeckite (crocidolite variety)
Mineral
Polished reddish banded jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions
metamorphic
Jasper
Silicon dioxide (SiO2) with iron impurities
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Citrine
Quartz (SiO₂) variety
Mineral
Carnelian Ring
SiO2 (Variety of Chalcedony)
gemstone
Sandstone
Arenite (SiO2 variety)
sedimentary
Vesicular Basalt (Lava Rock)
Basalt (Vesicular Variety)
igneous
Porphyritic Andesite
Andesite (porphyritic variety)
igneous
Amethyst
Quartz (SiO2) variety
Mineral
Fancy Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Jasper (specifically Red Jasper or Iron-stained Chert)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper (likely brecciated jasper)
Microcrystalline quartz/chalcedony (SiO₂), with possible iron-oxide coloring
sedimentary
Jasper
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Polished banded jasper (likely picture jasper)
Microcrystalline quartz, chiefly SiO₂; jasper with iron-oxide staining
sedimentary
Granite
Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Jasper (likely brecciated or chalcedony-rich jasper)
Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide impurities
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
River Stone (River Pebbles)
Alluvial Deposit (typically Quartzite, Sandstone, or Granite clasts)
sedimentary
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2)
mineral
Polished reddish-brown stone bead, possibly jasper
Likely iron-rich microcrystalline quartz (jasper; SiO₂), but the image is not sufficient for a confident identification
gemstone
Dalmatian jasper (Dalmatian stone)
Feldspar-rich porphyritic igneous rock, commonly sold as Dalmatian jasper; dark spots are mainly amphibole and/or tourmaline minerals
igneous
Iron-rich jasper (likely rough jasper/chert)
Microcrystalline quartz (SiO₂), colored by iron oxides
mineral
Amethyst (rough purple quartz)
Quartz, SiO₂; purple color from trace iron and natural irradiation
mineral
Polished banded agate
Microcrystalline quartz (SiO₂), chiefly chalcedony
mineral
Jasper
SiO2
sedimentary