Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Category
Man Made Rock (Technosol)
Browse man made rock (technosol) specimens identified by the Rock Identifier community.
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Quartzite with Calcite Accretion
Metamorphosed Quartz Sandstone (SiO2 with CaCO3 coating)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Dark mafic igneous rock, likely basalt or gabbro
Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine
igneous
Weathered basalt or mafic volcanic rock
Basalt; typically plagioclase feldspar, clinopyroxene, and often olivine or iron oxides
igneous
Basalt with Vesicular Amygdule
Extrusive igneous rock (Mafic)
igneous
Crushed Granite Gravel
Granite (Plagioclase feldspar, Quartz, Alkali feldspar, Biotite)
igneous
Greenstone / Serpentinite
Serpentinite (composed primarily of serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Sandstone Pebble (Ventifact)
Arenite (mostly SiO2)
sedimentary
Serpentine
Antigorite/Chrysotile group (Mg3Si2O5(OH)4)
metamorphic
Sandstone (Greywacke)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Rose Quartz (likely carved)
Rose Quartz (SiO2)
Mineral
Rose Quartz Carving
Quartum roseum (Variety of Quartz, SiO2)
Mineral
Sandstone (Pebble)
Sandstone (SiO2 dominated clastic sedimentary rock)
sedimentary
Dark basalt or fine-grained mafic rock
Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine or iron-titanium oxides
igneous
Granite Pebble
Granite
igneous
![Turquoise (Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]) — mineral](https://media.rockidentification.com/054f3fa7-f73a-456a-b566-38d3b6295e69-thumbnail.jpg)
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
mineral
Banded Sedimentary Rock
Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands
sedimentary
Ironstone (Limonitic Concretion)
Limonite (FeO(OH)·nH2O) with Goethite and Hematite inclusions
sedimentary
Painted River Rock
Polished fluvial clast with acrylic/synthetic pigment coating
Sedimentary or Metamorphic (base substrate)
Siltstone or Mudstone
Argillaceous sedimentary rock
sedimentary
Polished basalt (likely vesicular basalt)
Basalt; predominantly plagioclase, clinopyroxene, and commonly olivine or iron-titanium oxides
igneous
Fenestella Bryozoan Fossil
Fenestella (class Stenolaemata)
fossil
Granite (Specimen: Logan Rock)
Phaneritic plutonic igneous rock (mainly Quartz, Feldspar, and Mica)
igneous
Fine-grained dark igneous rock, likely basalt
Basalt; predominantly plagioclase feldspar and pyroxene, commonly with minor olivine and iron-titanium oxides
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Graphic Granite (or Rapakivi-textured Granite)
Alkali feldspar granite
igneous
Sandstone (Garden Boulder)
Sandstone (SiO2 dominated)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Apache Tear
Obsidian (Volcanic Glass)
igneous
Quartz Vein in Basalt or Sedimentary Host Rock
Silica-veined lithic fragment (SiO2 in host matrix)
sedimentary
Agated Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz pebble (Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (plutonic felsic rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Beach Agate / Jasper Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz fragment (Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble with Drusy/Crystalline Pocket
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion (Moqui Marble / Boji Stone)
Sedimentary Iron Oxide Concretion (Fe2O3 / FeO(OH))
sedimentary