Vesicular Basalt with Epidote
Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
igneous
Category
Mineral In A Matrix (Likely Quartz Or Feldspar)
Browse mineral in a matrix (likely quartz or feldspar) specimens identified by the Rock Identifier community.
Ocean Jasper Mushroom
Orbicular Jasper (Silicon Dioxide, SiO2 mixed with various impurities)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz-Veined Mudstone
Argillaceous Mudstone with Quartz Veining
sedimentary
Limestone with Chert or Siltstone bands
Sedimentary carbonate rock (CaCO3) often with siliceous impurities
sedimentary
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Dumortierite Quartz
AlAl6BSi3O18 (Dumortierite) within SiO2 (Quartz)
mineral
Epidote
Epidote - {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Granite
Phaneritic Felsic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)
igneous
Unakite
Epidotized Granite
metamorphic
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Conglomerate
Conglomerate (SiO2 primary clasts with lithic matrix)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Quartz (Smoky/Milky variant)
Silicon Dioxide (SiO2)
mineral
Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Pink Granite
Phaneritic Felsic Igneous Plutonic Rock
igneous
Granite Pebble
Granite (composition of Quartz, Alkali Feldspar, and Plagioclase)
igneous
White Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Granite
Granite
igneous
Porphyritic Rhyolite (Red Porphyry)
Porphyritic Rhyolite (Felsic volcanic rock)
igneous
Labradorite (likely Black Labradorite or Larvikite)
Labradorite (Na,Ca)(Al,Si)4O8. If a rock, it is typically anorthosite, gabbro, or norite, or a variety of syenite called Larvikite if it is specifically from Larvik, Norway.
Mineral/Igneous Rock
Schist (Garnet-Mica Schist)
Garnetiferous Mica Schist (primarily Muscovite/Biotite and Almandine Garnet)
metamorphic
Quartz Pebble (Chert/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Vein (Iron-stained)
Silicon Dioxide (SiO2) with limonite/hematite staining
mineral
Fossiliferous Rock (likely Dinosaur Fossil in Matrix)
Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)
sedimentary
Granite
Phaneritic intrusive igneous rock
igneous
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Granite
Granite (Mainly Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Rose Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Banded Gneiss
Gneiss (pronounced "nice")
metamorphic
Quartz (Smoky/Milky Pebble)
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix
Emerald (Beryllium Aluminum Silicate), Be3Al2(SiO3)6
mineral
Milky Quartz with inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Orange Quartz with Epidote
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate hydroxide (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
mineral
Dalmation Stone (often called Dalmatian Jasper)
Antiperthite-rich Microgranite
igneous
Granodiorite (Water-worn Pebble)
Granodiorite
igneous
Gneiss (High-grade Metamorphic Rock)
Gneiss (Metamorphic silicate rock)
metamorphic