Gneiss
High-grade foliated metamorphic rock
metamorphic
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
Browse igneous or metamorphic (base stone); anthropogenic (decoration) specimens identified by the Rock Identifier community.
Snowflake Obsidian
Spherulitic Volcanic Glass (SiO2 + impurities)
igneous
Granite
Granite (Phaneritic Quartz-Feldspar intrusive rock)
Igneous
Schist
Mica Schist
metamorphic
Epidosite (Epidote-rich rock)
Epidotalite (primarily Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Orthoclase Feldspar
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Serpentine
Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
Igneous
Diorite (Salt and Pepper Rock)
Phaneritic Plutonic Diorite; chemical composition roughly 52-63% silica (SiO2)
igneous
Green Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Gneiss (specifically a weathered or stream-worn specimen)
Gneiss (Foliated Metamorphic Rock)
metamorphic
Milky Quartz
Quartz (SiO2)
mineral
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Green Schist
Greenschist (composed of Chlorite, Actinolite, and Epidote)
metamorphic
Serpentine
Serpentinite (group of minerals: (Mg,Fe,Ni,Al)3Si2O5(OH)4)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sunstone
Oligoclase (Feldspar variety), (Na,Ca)(Si,Al)4O8
mineral
Mica Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Schist (Micaceous Schist)
Micaceous schist (Mainly Muscovite/Biotite mixed with Quartz)
metamorphic
Labradorite
Labradorite (a calcium-enriched feldspar mineral), (Ca, Na)(Al, Si)4O8
mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Strawberry Quartz
Quartz with Hematite inclusions (SiO2 + Fe2O3)
mineral
Schist
Mica Schist (predominantly Muscovite or Biotite)
metamorphic
Apatite
Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Star Sapphire
Corundum (Al2O3)
mineral
Citrine (Yellow Quartz)
Silicon Dioxide (SiO2)
Mineral
Nuummite
Nuummite (mixture of Anthophyllite and Gedrite)
metamorphic
Snowflake Obsidian
Volcanic glass (SiO2) with Cristobalite (SiO2) inclusions
igneous
Greenstone / Greenschist
Chlorite schist / Meta-basalt
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Crushed Granite Gravel
Granite (Mainly Quartz, Feldspar, and Mica)
igneous
Bumblebee Jasper
Calcite-Auripigment-Pyrite-Realgar assemblage (Carbonate/Sulphide mixture)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst (Faceted)
Silicon Dioxide with Iron impurities (SiO2)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide - SiO2)
Mineral
Granite (with Muscovite Mica)
Phaneritic Felsic Igneous Rock (primarily Quartz SiO2, K-Feldspar KAlSi3O8, and Muscovite KAl2(AlSi3O10)(OH)2)
igneous