Clear Quartz (Rock Crystal Fragments)
Silicon Dioxide (SiO2)
mineral
Category
Synthetic Or Natural Fiber
Browse synthetic or natural fiber specimens identified by the Rock Identifier community.
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Limonite (Yellow Ochre)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Basalt
Mafic Igneous Rock
igneous
Clear Quartz
SiO2 (Silicon Dioxide)
mineral
Coquina
Biogenic Limestone (Coquina)
sedimentary
Silicon
Silicon (Si)
mineral
Quartz (Citrine or Iron-Stained variety)
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)
Iron-Stained Quartz Pebble
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Pumice
Pumice (Amorphous volcanic glass)
igneous
Amber (Cherry Amber)
Succinite (C10H16O)
Organic Gemstone
Amber (specifically Cherry Amber)
Succinite (with the chemical formula C10H16O)
Organic Gemstone (not a mineral)
Black Tourmaline (Schorl)
NaFe3Al6(BO3)3Si6O18(OH)4
Mineral
Sunstone
Plagioclase Feldspar (specifically Oligoclase variety containing hematite or goethite inclusions)", composition: (Ca,Na)(Al,Si)2Si2O8
Mineral
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Banded Agate (specifically Sardonyx or Carnelian Agate)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Yellow Quartz Pebble (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Libyan Desert Glass
Impactite silica glass (SiO2)
tektite (impact glass)
Hematite
Iron(III) oxide (Fe2O3)
mineral
Carnelian Agate
Silicon dioxide (SiO2) - variety of chalcedony
mineral
Yellow Quartz (Citrine or Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Halite
Sodium Chloride (NaCl)
Mineral
Rough Diamond
Diamond (Native Carbon), C
mineral
Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral
Diamond (Princess Cut)
Carbon (C)
mineral
Blue Quartzite (Blue Aventurine / Dumortierite Quartz)
Quartzite with inclusions (SiO2 with AlAl4BSi3O18)
metamorphic
Magnetite (Lodestone variety)
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Carnelian (a variety of Chalcedony)
Cryptocrystalline Quartz (SiO2) with iron oxide inclusions
Mineral
Chert (often found as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Diamond
Native Carbon (C)
mineral
Diamond (Green tinted)
Carbon (C) with trace impurities or lattice defects
mineral
Pink Granite
Granite (Phaneritic Felsic Igneous Rock)
igneous
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (SiO2 primary composition)
sedimentary
Jasper-Agate Breccia
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Granite
Granite (Mainly Quartz, Feldspar, and Mica)
igneous
Ferruginous Quartz (Agatized/Iron-stained Quartzite)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
metamorphic