Scoria
Scoria (a vesicular basalt or andesite)
igneous
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
Browse man made material, not a natural rock or mineral specimen specimens identified by the Rock Identifier community.
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Limonite Concretion (Ironstone)
Limonite (FeO(OH)·nH2O) / Goethite
sedimentary
Caliche (with Lichen Cover)
Calcium carbonate-cemented soil layer (CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Iron-stained Quartzite)
Silicon Dioxide (SiO2)
sedimentary
Coral (Precious Coral)
Corallium rubrum (Red Coral), Paracorallium japonicum (Momo Coral), Pleurocorallium elatius (Sardinian Coral), various other species within the Corallidae family. Chemically, it's primarily Calcium Carbonate (CaCO 3 ).
Mineral, Organic Gemstone
Sandstone
Arenite (primarily SiO2)
sedimentary
Citrine
Silicon Dioxide (SiO2)
mineral
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety
Mineral
Unable to Identify (Image Obscured)
Indeterminate
Porphyritic Basalt (Peanut Obsidian/Star Galaxy-style)
Porphyritic Basalt (Silica-rich Volcanic Rock)
igneous
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Diamond (Cut Specimen)
Carbon (C)
mineral
Basalt with Quartz Veining
Basalt (Mafic Extrusive Igneous Rock) with SiO2 (Silicon Dioxide) veins
igneous
Citrine (Quartz variant)
SiO2 (Silicon Dioxide)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions (K(Al,Cr)2AlSi3O10(OH)2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Ruby (Corundum)
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Amethyst (Rough Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone (Pebble/Cobble)
Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)
Sedimentary
Granite
Phaneritic Plutonic Felsic Rock
igneous
Quartz Druze on Matrix (Geode Fragment)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Blue Sapphire
Corundum (Al2O3)
mineral
![Turquoise with Pyrite (Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O] with Iron Pyrite (FeS2)) — mineral](https://media.rockidentification.com/157e6415-0364-437c-b0a4-74ad43800d08-thumbnail.jpg)
Turquoise with Pyrite
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O] with Iron Pyrite (FeS2)
mineral
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
mineral
Rhodonite (in matrix)
Rhodonite (Mn,Fe,Mg,Ca)SiO3
Mineral
Sunstone
Plagioclase feldspar (with Copper or Hematite inclusions)
mineral
Amazonite
Potassium Feldspar (Microcline), K(AlSi3O8)
mineral
Banded Agate Geode
Silicon Dioxide (SiO2)
mineral
Diorite (Salt and Pepper Rock)
Diorite (comprising Plagioclase Feldspar, Hornblende, and Biotite)
igneous
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Banded Agate
Cryptocrystalline Silica (SiO2)
mineral
Rough Diamond
Diamond (Native Element Carbon, C)
mineral
Yellow Quartz (Citrine/Gold Quartz)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Igneous Rock (Granite)
igneous
Smoky Quartz and Feldspar Pegmatite
Granitic Pegmatite (chiefly SiO2 and KAlSi3O8)
igneous
Green Quartz (including Prase or Aventurine variants)
Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)
mineral
Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)
Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)
mineral