Ambergris
Ambrein (C30H52O Derivative)
Organic (Zoogenic)
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
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Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 dominated)
sedimentary
Green Aventurine
SiO2 (Silicon Dioxide with inclusions of Fuchsite)
mineral
Aventurine (Green Aventurine)
Quartz variety (SiO2 with fuchsite inclusions)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Black Tourmaline (Schorl)
Schorl (Sodium iron aluminum borosilicate hydroxide) NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Jade (Nephrite and Jadeite)
Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2; Jadeite: NaAlSi2O6
metamorphic
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Quartz (Smoky/Grey variety)
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon dioxide (SiO2) with Fuchsite inclusions
mineral
Yellow Sapphire
Corundum (Al2O3 with trace amounts of iron)
gemstone
Banded Gneiss / Veined Metamorphic Pebble
Metamorphic Rock with Quartz/Feldspar Veins
metamorphic
Basalt and Quartz Pebble
Basalt (Igneous) and Quartzite/Quartz (SiO2) pebble
igneous and sedimentary
Yellow Quartzite (Iron-stained)
Quartzite (primarily SiO2 with Fe2O3 staining)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
River Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Mineral, potentially a rock with chalcedony/jasper.
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Aventurine
Quartz (Variety Aventurine), SiO2
mineral
Quartzite pebble
Quartzite (primarily SiO2)
metamorphic
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8
mineral
Fuchsite
Cr-bearing Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Basalt
Basalt (Mafic Extrusive)
igneous
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Black Tourmaline (Schorl)
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Fuchsite (Chrome Mica)
K(Al,Cr)2(AlSi3O10)(OH)2
metamorphic
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Schorl (Black Tourmaline)
NaFe3Al6Si6O18(BO3)3(OH)3OH (Iron tourmaline)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Sandstone (Red Sandstone)
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Tumbled light-colored stone, possibly quartzite or limestone
Indeterminate; likely quartzite (mostly SiO₂) or calcitic limestone (CaCO₃)
metamorphic
Shale
Argillite / Shale
sedimentary
Firewood (Wood Log)
Lignum (Plant tissue composed of cellulose and lignin)
Organic (Non-geological)
Polished/tumbled quartz-rich pebble, possibly jasper or quartzite
Indeterminate; likely microcrystalline quartz (SiO₂), potentially iron-stained jasper or quartzite
metamorphic
Sandstone
Arenite (SiO2 based with mineral cements)
sedimentary
Quartz-Veined Gneiss or Metamorphic Rock with Quartz Veins
Quartz-veined metamorphic rock (Silicate mineral assemblage)
metamorphic
Milky quartz with iron-oxide staining
Quartz (SiO₂), likely ferruginous milky quartz
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Polished black mineral or volcanic glass fragment
Indeterminate; possibly obsidian or black tourmaline
mineral