Emerald in Host Rock
Beryl (Be3Al2Si6O18) containing Chromium and/or Vanadium
mineral
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
Learn about Mineral Based Composite in the encyclopedia
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Blue-green turquoise (probable)
Turquoise, hydrous copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Micro-Meteorite (Micrometeoroid)
Extraterrestrial Spherule (Silicate or Iron-Nickel)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Green Kyanite
Kyanite (Al2SiO5)
mineral
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
mineral
Conglomerate
Polymictic Conglomerate
sedimentary
Tumbled chalcedony or quartz-rich stone
Microcrystalline quartz, SiO₂; possibly pale chert or chalcedony
mineral
Desert Rose
Selenite Rose (Gypsum: CaSO4·2H2O)
mineral
Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Metallic sulfide-rich rock, possibly pyrite-bearing schist or marcasite specimen
Likely pyrite (FeS₂) in a foliated host rock; exact identification requires testing
metamorphic
Sandstone River Pebble
Arenite (SiO2 predominantly)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
River Pebbles (Sandstone and Quartzite)
SiO2 (Quartz) dominated clastic rocks
sedimentary and metamorphic
Pyrite-bearing sulfide specimen
Pyrite (FeS₂), possibly with chalcopyrite and weathered sulfides
mineral
Honey calcite specimen
Calcite (calcium carbonate, CaCO₃)
mineral
Iron-rich rock, possibly weathered basalt or ironstone
Tentatively ferruginous basalt; exact identification requires testing
igneous
Red Sandstone (Siltstone pebble)
Arenite / Siltstone (Silicon dioxide based with hematite impurities)
sedimentary
Diamond
Natural Carbon (C)
mineral
Native Gold (in the form of jewelry)
Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Quartz arenite / Lithic sandstone
sedimentary
Malachite (possibly chrysocolla-bearing)
Malachite, Cu₂CO₃(OH)₂; the blue-green areas may include chrysocolla, Cu₂H₂Si₂O₅(OH)₄
mineral
Tumbled blue glassy mineral, possibly sodalite or blue aventurine
Identification uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) or blue-dyed quartz/slag-like material
mineral
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
Mineral
Raw pale-golden mineral aggregate, likely iron-stained quartz or calcite
Uncertain from photograph; possible quartz (SiO₂) or calcite (CaCO₃) with limonite staining
mineral
Sandstone
Arenite (SiO2 based with quartz, feldspar, or lithic fragments)
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Slickenside
Tectonic Fault Scarp Surface
metamorphic
Hag Stone (Holed Quartzite Pebble)
Quartzite (SiO2 based) with natural vug or erosion hole
sedimentary/metamorphic
Chalcedony with jasper (likely brecciated jasper)
Microcrystalline quartz, SiO₂, with iron-oxide-rich jasper fragments
mineral
Likely rounded dark pebble
Indeterminate; possibly basalt, diabase, or a dark chert/river pebble
igneous
Tumbled brown stone, possibly amber or polished agate
Indeterminate from image; possibilities include amber (fossilized plant resin, organic) or chalcedony/quartz (SiO₂)
mineral
Granite
Phaneritic Plutonic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Dyed Blue Agate
Silicon Dioxide (SiO2) with artificial cobalt-based dye
mineral
Polished fossiliferous limestone, possibly ammonite-bearing
Calcite-rich limestone (CaCO₃), with visible fossil or shell fragments
fossil
Bumble Bee Jasper
Calcite-bearing Volcanic Tuff (not a true Jasper)
sedimentary
Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral