Chrysocolla in Matrix
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Silicate/Secondary Copper Mineral)
mineral
Category
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Browse this image does not display a rock, mineral, or geological specimen. it shows a human hand wearing a ring. specimens identified by the Rock Identifier community.
Basalt
Basalt (a mafic extrusive igneous rock)
Igneous
Limonite (Iron Stone Concretion)
Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O
mineral
Nuummite
Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)
metamorphic
Gold Ore in Quartz
Auriferous Quartz (SiO2 with Au inclusions)
mineral
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
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Amethyst Geode (Carved)
Amethyst (Violet Crystalline Quartz - SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Yellow Ochre / Limonite
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Mookaite Jasper
Siliceous (chert) sedimentary rock, a form of Jasper
Sedimentary
Moonstone (in a halo ring setting)
Orthoclase Feldspar (containing alternating layers of Albite), (KAlSi3O8)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
River Stone / Pebble
Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)
Mineral, Sediment
Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Diamond Druzy (Crystalline Diamond)
Carbon (C)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Jade (likely Jadeite)
Jadeite (a pyroxene mineral) or Nephrite (a variety of amphibole mineral)
Mineral
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Sandstone
Arenite (with iron oxide banding)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Gold
Native Gold (Au)
mineral
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
Mineral
Pegmatitic Granite
Granite with Orthoclase Feldspar and Quartz (SiO2, KAlSi3O8)
igneous
Quartz
Quartz (SiO₂)
Mineral
Milky Quartz with Country Rock contact
Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock
mineral
Desert Varnish (on Sandstone)
Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)
sedimentary
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Biotite Mica
K(Mg,Fe)3AlSi3O10(OH)2
Mineral in a matrix (likely quartz or feldspar)
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Sandstone (with Liesegang rings or Oxidation)
Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)
sedimentary
Granite
Granite (Phaneritic Igneous Rock)
Igneous
Sandstone (with cross-bedding)
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Black Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Amethyst (Quartz)
SiO2 (Silicon Dioxide)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Granite
Phaneritic high-silica plutonic rock (composed primarily of Quartz, Feldspar, and Mica)
igneous