Rose Quartz
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Chalcedony Variety)
Browse mineral (chalcedony variety) specimens identified by the Rock Identifier community.
Obsidian
Obsidian (Volcanic glass), SiO2 (major component)
igneous
Banded Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Iron-Stained Quartzite
Recrystallized Meta-Quartzite (primarily SiO2)
metamorphic
Petrified Wood
Silicified wood, primarily composed of Quartz (SiO2)
Mineral, often found in sedimentary deposits
Dragon Blood Jasper (Lizard Stone/Septarian Chalcedony)
Epidote with Black Hornblende and White Quartz mixture
metamorphic
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amphibolite
Amphibolite
metamorphic
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Garnet (likely Almandine or Pyrope)
Garnet Group, Nesosilicates (Complex chemistry, e.g., Almandine: Fe3Al2Si3O12)
mineral
Sandstone (with possibly iron oxides and other minerals)
Sandstone
Sedimentary rock
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3)(OH)3(OH))
mineral
Moonstone
Adularia (orthoclase) or Albite (plagioclase), a feldspar mineral (KAlSi3O8 or NaAlSi3O8 respectively, often a mixture)
mineral
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (and Flint variant)
Chert (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Aventurine
Silicon Dioxide (SiO2) with inclusion of Mica
Mineral (Variety of Quartz)
Chert (Jasper/Carnelian variety)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Quartz (Dumortierite Quartz)
Quartz (SiO2) with inclusions of Dumortierite (Al7(BO3)(SiO4)3O3)
mineral
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Granite (with alteration)
Granite (Felsic intrusive igneous 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
Banded Chert in Matrix
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Obsidian (principally SiO2 silicon dioxide)
igneous
Serpentine
Serpentinite (composed mainly of Group Minerals Antigorite, Chrysotile, and Lizardite; Mg3Si2O5(OH)4)
metamorphic
Obsidian
Volcanic glass (mainly SiO2 with inclusions)
igneous
Obsidian
Volcanic glass (SiO2 - Silicon dioxide predominant composition)
Igneous
Schist
Schist
metamorphic
Red Garnet
Garnet Group (e.g., Pyrope, Almandine, Spessartine, Grossular, Andradite, Uvarovite)
Mineral
Obsidian
Obsidian (Volcanic Glass; SiO2 content > 70%)
igneous
Popcorn
Zea mays everta (P. Wilson) (Botanical name for the corn variety)
Organic/Biogenic
Kyanite (Blue and Green varieties)
Kyanite (Al₂SiO₅)
mineral
Stichtite in Serpentine (Atlantasite)
Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)
Metamorphic rock / Mineral variety
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Calcite
Calcite (CaCO3)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Banded Agate (Onyx type)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Garnet Schist
Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)
metamorphic
Clear Quartz (beads in a bracelet)
Quartz (SiO2)
Mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Mixed Tumbled Stones (Mostly Agate, Jasper, and Quartz)
Silicon Dioxide (SiO2)
sedimentary and metamorphic minerals