Diorite
Intrusive Igneous Rock (Intermediate Composition)
igneous
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
Learn about Mineral Based Composite in the encyclopedia
View all →
Dragon Vein Agate
Chalcedony (Quartz) - SiO2
mineral
Aqua Aura Quartz
Silicon Dioxide (SiO2) bonded with Gold (Au)
mineral (treated)
Diorite river pebble
Diorite (intermediate plutonic rock)
igneous
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Vesicular Basalt
Aphanitic Mafic Igneous Rock (with vesicles)
igneous
Red Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Granodiorite
Granodiorite (phaneritic intrusive igneous rock)
igneous
Diorite (Salt and Pepper Rock)
Diorite
igneous
Pegmatite with muscovite mica
Granitic pegmatite; quartz (SiO₂), feldspar, and muscovite (KAl₂(AlSi₃O₁₀)(OH)₂), locally biotite/tourmaline
igneous
Chert Breccia (with Iron Staining)
Microcrystalline Quartz (SiO2) with iron oxides (Limonite/Goethite)
sedimentary
Snowflake Obsidian (Tumbled)
Obsidian with Cristobalite inclusions
igneous
Lepidolite (likely)
K(Li,Al)3(Al,Si)4O10(F,OH)2 (Phyllosilicate mineral, part of the mica group)
Mineral
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Schist (Graphite or Mica rich)
Crystalline Schist (often containing Muscovite, Biotite, or Graphite)
metamorphic
Olivine Basalt (with Epidote and Serpentine)
Mafic Volcanic Rock (Basalt)
igneous
Basalt (Weathered/River worn)
Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)
igneous
Basalt with Vesicular Texture (Beach Cobble)
Vesicular Basalt (Aphanitic Igneous Rock)
igneous
Mica Schist with Pyrite
Muscovite/Biotite Schist with Iron Sulfide (FeS2)
metamorphic
Lepidolite and Tiger's Eye
K(Li,Al)3(Si,Al)4O10(F,OH)2 (Lepidolite) / SiO2 (Quartz/Tiger's Eye)
mineral
Seraphinite
Clinochlore (a variety of the chlorite group)
mineral
Crackle Quartz (Dyed)
SiO2 (Silicon Dioxide) - Treated
mineral
Ruby in Fuchsite
Corundum (Al2O3) in Fuchsite (K(Al,Cr)3Si3O10(OH)2)
Mineral
Basalt
Basalt
igneous
River Cobble (Quartzite-rich Sandstone)
Clastic Sedimentary Rock (Litharenite/Quartzite transition)
sedimentary
Quartz Vein in Mica Schist
Quartz (SiO2) with Muscovite/Biotite Schist
metamorphic
Heat-Treated Amethyst (Commercial Citrine)
Silicon Dioxide (SiO2) - Macro-crystalline Quartz
mineral
Basalt Pebble with Epidote/Olivine
Vitreous Basalt (SiO2 with Ca/Mg/Fe silicates)
igneous
Pink Granite (Potassium-rich Granite)
Phaneritic Felsic Igneous Rock (primarily SiO2, Al2O3, K2O)
Igneous
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Mica Schist
Mica Schist (predominantly composed of Muscovite or Biotite silicates)
metamorphic
Muscovite Mica Schist
Metamorphic rock rich in muscovite mica (KAl2(AlSi3O10)(F,OH)2)
metamorphic
Basalt Pebble
Basaltic Igneous Rock
igneous
Green Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Serpentine (Serpentinite)
Hydrous magnesium iron silicate, (Mg,Fe)3Si2O5(OH)4
metamorphic
Titanium-coated Metal Cube (Man-made Fidget Toy)
Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)
Mineral alternative / Synthetic
Vesicular Basalt
Vesicular Basalt (Aphanitic Mafic Rock)
igneous
Metal Alloy (Likely Pewter or Sterling Silver)
Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).
Man-made material (metal)
Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral