Banded Agate
Sedimentary Cryptocrystalline Quartz (SiO2)
mineral
Category
Mineral (Chalcedony Variety)
Browse mineral (chalcedony variety) specimens identified by the Rock Identifier community.
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Serpentinite (Serpentine Rock)
Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.
Metamorphic Rock
Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Garnet (likely Pyrope or Almandine)
Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.
Mineral
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
Mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Hematite (Botryoidal/Kidney Ore)
Iron(III) oxide (Fe2O3)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Rose Quartz
Rose Quartz (SiO2)
mineral
Garnet Beads
Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)
Mineral
Bronzite
MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)
Mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Geode (Quartz)
Silicon Dioxide (SiO2)
mineral
Epidote
Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)
Mineral
Beryl (likely Aquamarine or Green Beryl)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Amazonite
K(AlSi3O8) - Microcline variant
mineral
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Quartz (beads)
SiO2 (Silicon Dioxide)
Mineral
Red Sandstone
Arenite (Fe2O3-rich)
sedimentary
Yellow Jadeite
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt (primarily SiO2, MgO, FeO, and CaO)
Igneous
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz (Microcrystalline/Macro crystalline variety)
Silicon Dioxide (SiO2)
mineral
Diamond
Diamond (Pure Carbon, C)
mineral
Satin Spar (commercially called Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Milky Quartz (Tumbled)
Quartz (Silicon Dioxide, SiO2)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Dyed Dragon Vein Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace elements of Titanium, Iron, or Manganese
mineral