Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Metamorphic Rock (Specifically A Rock Composed Of Minerals)
Browse metamorphic rock (specifically a rock composed of minerals) specimens identified by the Rock Identifier community.
Basalt (River Cobble)
Mafic Igneous Basalt (composed primarily of Plagioclase feldspar, Pyroxene, and Olivine)
Igneous
Lake Superior Agate
Banded Chalcedony (Silicon Dioxide / SiO2)
mineral
Muscovite Mica
Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))
Mineral
Porphyry (likely Porphyritic Andesite or Basalt)
Porphyritic Igneous Rock
igneous
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Banded Agate (specifically Lake Superior Agate style)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Granitic Pegmatite (River Rock specimen)
Granite / Pegmatite (composed of SiO2, KAlSi3O8, and NaAlSi3O8)
igneous
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Granodiorite
Granodiorite
igneous
Olivine in Basalt matrix
Peridotite (Mg, Fe)2SiO4
igneous
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Plutonic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Yellow Quartz (Citrine or Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Dumortierite Quartz (Blue Quartz)
Al7BO3(SiO4)3O3 (Aluminum Boro-silicate included in Quartz)
mineral
Quartz (various varieties)
SiO₂ (Silicon Dioxide)
Mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Pink Tourmaline (Rubellite)
Elbaite (Tourmaline group) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
mineral
Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Unidentifiable Specimen
Undetermined
Unknown
River Rock (likely Quartzite or Chert)
Quartzite (primarily SiO2)
metamorphic
Quartz (River Siltstone Quartzite Pebble)
Silicon Dioxide (SiO2)
metamorphic
Quartz Pebble (Water-worn Quartzite)
Silicon Dioxide (SiO2)
metamorphic
Agatized Petrified Wood
Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood
metamorphic
Biotite Mica in Host Rock
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Emerald / Green Beryl
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Schist with Quartz Vein
Mica Schist with Crystalline Quartz (SiO2)
metamorphic
Basalt
Basalt (extrusive igneous rock)
Igneous
Desert Rose
Gypsum (variety Selenite) or Barite, CaSO4·2H2O
mineral
Fossilized Coral
Cnidaria (Anthozoa), often replaced by Calcium Carbonate (CaCO3) or Silica (SiO2)
sedimentary
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Lemon Quartz (Orizaba/Citrinated Quartz)
Silicon Dioxide (SiO2) with iron impurities/treatment
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Blue Lace Agate
Chalcedony (a form of Quartz) - SiO2
Mineral
Greenstone / Diorite
Intermediate plutonic igneous rock
igneous
Gneiss
Gneiss
metamorphic
Chert Pebble with Quartz Veins
Microcrystalline Quartz (SiO2)
sedimentary