Granite
Granite (composed primarily of Quartz SiO2, Alkali Feldspar, and Plagioclase Feldspar)
igneous
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with included minerals (Fuchsite for green)
Metamorphic Rock / Mineral (Quartz Variety)
Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Pink Granite
Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)
igneous
Tiger's Eye (Brown/Dark variety)
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Hypersthene
Hypersthene (Magnesium Iron Silicate - (Mg,Fe)SiO3)
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
mineral / metamorphic
Schist (Diamond Drill Core)
Mica Schist
metamorphic
Indigo Gabbro
Gabbro (MaFIC intrusive rock)
igneous
Amethyst (Purple), Sulfur (Yellow), and Blue Apatite
SiO2 (Quartz), S (Native Sulfur), Ca5(PO4)3(F,Cl,OH) (Apatite Group)
mineral
Smoky Quartz (with possible Garnet inclusions)
Silicon Dioxide (SiO2)
mineral
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
metamorphic
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (extrusive igneous rock)
Igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Graphite
Graphite (Native Carbon), Formula: C
Metamorphic
Quartz
Quartz (SiO2, Silicon Dioxide)
Mineral
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
man-made (synthetic rock)
Quartz
Silicon dioxide (SiO2)
Mineral
Pyrite in Matrix (Quartz/Schist)
Iron Sulfide (FeS2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Brown Antique Granite
Anorthosite (Technically a plutonic rock composed mainly of plagioclase feldspar)
igneous
Granite and Igneous Mix
Phaneritic Felsic to Mafic Intrusive Rocks
igneous
Quartz Vein (Iron-stained)
Silicon Dioxide (SiO2) with limonite/hematite staining
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Sapphire (Tumbled/Polished)
Corundum (Al2O3)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with inclusions)
metamorphic
Shungite
Non-crystalline carbon (allotrope of carbon)
metamorphic
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Pseudomorph of quartz after crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Greenschist
Chlorite schist
metamorphic
Note: This is a Man-Made Object (Costume/Prop Patch)
Synthetic fiber and pigments (Cellulose/Plastic-based composite)
Non-geological
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Gossan (Iron Hat)
Limonitic Gossan (Fe-oxide/hydroxide complex)
igneous
Diorite (River Pebble)
Intermediate plutonic igneous rock
igneous