Specular Hematite (Specularite)
Hematite (Iron(III) oxide) - Fe2O3
mineral
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Diorite (River Pebble)
Diorite
igneous
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Goethite
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
African Turquoise (Jasper)
Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)
Rock
Sandstone
Arenite (SiO2 primarily)
sedimentary
Stilbite
Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)
mineral
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Aventurine (specifically Green Aventurine)
Silicon Dioxide (Quartz) with inclusions of Fuchsite; SiO2 + K(Al,Cr)2AlSi3O10(OH)2
metamorphic
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Dyed Agate Slice
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Satin Spar (Selenite variant)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Aluminum Slag
Anthropogenic Aluminum (Al)
mineral
Agate
Agate (Silicon Dioxide, SiO2)
mineral
Slate
Foliated low-grade metamorphic rock
metamorphic
Serpentine, likely a variety of Chrysoprase (green chalcedony) or a similar translucent green mineral.
Serpentine Group Minerals (e.g., Antigorite, Lizardite) or Chalcedony (SiO2) with nickel impurities for Chrysoprase green.
mineral
Tiger's Eye
Pseudomorph of Macrocrystalline Quartz after Crocidolite (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Phantom Quartz (Chlorite Inclusion)
Silicon Dioxide (SiO2) with Chlorite (Mg,Fe,Al)6(Si,Al)4O10(OH)8
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Gold Ore in Matrix
Native Gold (Au) in Quartz/Host Rock
mineral
Tiger's Eye (Multicolor/Variegated)
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxides)
mineral
Gold (in Opaque Matrix/Jewelry)
Native Gold (Au)
mineral
Gold-Bearing Quartz
Auriferous Quartz (SiO2 with native Au)
Mineral
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
SiO2 (Silicon Dioxide) with Iron Oxide inclusions (FeO(OH) / Fe2O3)
mineral
Gold Nugget
Native Gold (Au)
mineral
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Unknown Rock Specimen
igneous
Snowflake Obsidian
Volcanic glass containing Spherulites (SiO2)
igneous
Smoky Quartz with Feldspar
Quartz (SiO2) with Potassium Feldspar (KAlSi3O8)
mineral
Gold
Native Gold (Au)
mineral
Peach Selenite / Orange Gypsum
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Quartz (Citrine or Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Mother of Pearl (Nacre)
Nacre (Aragonite/Conchiolin), CaCO3 + Organic Polymers
mineral
Smoky Quartz Geode Slice
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral