Sandstone
Arenite (a specific type of sandstone with less than 15% matrix)
Sedimentary rock
Category
This Appears To Be A Man Made Metallic Object, Likely Jewelry, Not A Natural Rock, Mineral, Or Geological Specimen.
Browse this appears to be a man made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen. specimens identified by the Rock Identifier community.
Chert / Flint
Chert (varieties include Flint)
Sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Black Tourmaline (Schorl)
Schorl (Sodium iron silicate hydroxide boron silicate); NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Schorl (Black Tourmaline) in Pegmatite
Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Hematite
Iron (III) Oxide (Fe2O3)
mineral
Sandstone (Ferruginous)
Arenite (Fe2O3 stained)
sedimentary
Turquoise and Red Coral
Turquoise: CuAl6(PO4)4(OH)8·4H2O; Red Coral: Corallium rubrum (organic gemstone)
mineral
Tektite (Indochinite)
Tektite (Natural Glass, SiO2 + Al2O3)
mineral
Sunkissed Quartz or Hematoid Quartz
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Brown Jasper (Likely)
Jasper (Cryptocrystalline Silicon Dioxide - SiO2)
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Agate (a variety of Chalcedony, SiO2)
Mineral
Quartzite (Yellow/Iron-stained Quartz)
Quartzite (primarily SiO2 with iron oxide impurities)
metamorphic
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone
Sandstone, Iron-rich
sedimentary
Snowflake Obsidian
Vitreous Volcanic Rock (Amorphous Silicate), SiO2
igneous
Slag (Industrial Glass)
Artificial Vitreous Silicate
mineraloid (anthropogenic)
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Sandstone
Arenite (SiO2 based typically)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Quartz (Milky/Crystal Variety)
Silicon Dioxide (SiO2)
mineral
Magnetite (likely with weathered Limonite/Hematite)
Magnetite (Fe3O4) with iron oxide weathering
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Amygdaloidal Rhyolite (often called Lake Superior Agate relative)
Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)
igneous
Labradorite
Labradorite (Ca,Na)(Al,Si)4O8
mineral
Liesegang Ring Siltstone
Siltstone with iron oxide Liesegang bands
sedimentary
Rough Diamond
Diamond (Pure Carbon: C)
mineral
Muscovite Mica (likely on Quartz/Feldspar)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral