Unakite
Unakite (Metasomatized Granite)
metamorphic
Category
Organic (Often Found By Beachcombers)
Browse organic (often found by beachcombers) specimens identified by the Rock Identifier community.
Marble
Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)
metamorphic
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Magnetite (likely in Hematite or Ironstone)
Magnetite (Fe3O4)
mineral
Milky Quartz
Quartz / Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone
Arenite with Iron Oxide matrix (Fe2O3)
sedimentary
Greenstone
Greenschist / Greenstone (containing Chlorite, Epidote, Actinolite)
metamorphic
Granite (Phaneritic Igneous Rock)
Granite
igneous
Green Aventurine
Silicon Dioxide (SiO2) with inclusions (typically Fuchsite)
mineral
Granite
Phaneritic Felsic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Sandstone (Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Chalcedony (Agate/Carnelian type)
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary
Sandstone
Arenite
sedimentary
Gabbro
Gabbro (Mafic Plutonic Rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chrysocolla in Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4' nH2O on Quartz/Feldspar matrix
mineral
Sphalerite
Zinc Sulfide (Zn,Fe)S
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Jadeite and Nephrite (Jade)
Sodium Aluminum Silicate (Jadeite) / Calcium Magnesium Iron Silicate (Nephrite)
metamorphic
Lapis Lazuli (Tumbled)
Lazurite-dominated contact metamorphic rock
metamorphic
Ferrochrome Slag
Industrial Glassy Slag (Fe-Cr alloy byproduct)
Antropogenic (Man-made industrial byproduct)
Specular Hematite with Quartz
Ferric oxide (Fe2O3) and Silicon dioxide (SiO2)
Mineral
Erythrite (or Lab-Grown Cobaltite/Cinnabar Analog)
Erythrite (Co3(AsO4)2·8H2O)
mineral
Pink Granite
Phaneritic Plutonic Igneous Rock (high K-feldspar content)
igneous
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Turquoise in Matrix
Hydrous phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Yellow Jasper
Chalcedony (SiO2)
sedimentary
Rough Quartz (Grey-Green)
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Magnetite (potentially Hematite-rich)
Magnetite (Fe3O4)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Chert (Nodule)
Microcrystalline Silica (SiO2)
sedimentary
White Zircon
Zircon (Zirconium silicate, ZrSiO4)
mineral
Banded Agate (Gray/White)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Granite
Granite (High-silica plutonic rock)
igneous