Obsidian
Obsidian (Volcanic Glass, primarily SiO2)
igneous
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.
Milky Quartz
Quartz / Silicon Dioxide (SiO2)
mineral
Quartz (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Sea Glass (Teal/Turquoise)
Amorphous Silica (SiO2) with trace metal oxides
Anthropogenic (Man-made material processed by nature)
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Serpentinite
Serpentinite (containing minerals of the Serpentine subgroup: Antigorite, Lizardite, and Chrysotile; formula (Mg,Fe)3Si2O5(OH)4)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Clear Quartz (or Rock Crystal)
Quartz (SiO₂)
Mineral
Petrified Wood
Silicified Wood (SiO2)
Mineral / Fossil
Chert (also known as Flint or Common Chalcedony)
Cryptocrystalline Silica (SiO2)
sedimentary
Epidote
Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
Mineral
Dendritic Agate
Silicon Dioxide with Manganese or Iron Oxide inclusions (SiO2 + Mn/Fe)
mineral
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Black Obsidian
Volcanic Glass (predominantly SiO2, Silicon Dioxide)
igneous
Pyrite
Iron Pyrite (FeS₂)
Mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Gneiss
Gneiss (a type of metamorphic rock)
Metamorphic Rock
Jasper / Chert (Red)
Cryptocrystalline quartz (SiO2)
Sedimentary / Mineral
Amethyst
SiO2 (Silicon Dioxide) - a variety of Quartz
Mineral
Granite
Granite (a common rock type, not a single mineral; composed primarily of Quartz, Feldspar (Orthoclase and Plagioclase), and Mica (Biotite and/or Muscovite) and/or Amphibole)
Igneous
Rutile in Quartz (Rutilated Quartz)
SiO2 with TiO2 inclusions
Mineral
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite treated with acid
mineral
Pumice
Pumice (volcanic rock)
Igneous
Sandstone
Sandstone (various mineral compositions)
Sedimentary
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Dearest Jewelry (Multigemstone)
Combination of Diamond (C), Emerald (Be3Al2Si6O18), Amethyst/Rock Crystal (SiO2), Ruby (Al2O3), Emerald (Be3Al2Si6O18), Sapphire (Al2O3), and Topaz (Al2SiO4(F,OH)2)
Mineral
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Rose Quartz
Quartz (SiO₂), specifically a variety of Quartz
Mineral
Amethyst Geode
Quartz (SiO₂) with iron impurities
Mineral/Igneous (secondary formation)
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Labradorite (a variety of Feldspar)
Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)
igneous
Blue Tiger's Eye
Riebeckite (crocidolite variety)
Mineral
Fluorite (often referred to casually as 'Fluorspar' in industrial contexts)
Fluorite (CaF2)
Mineral
Granite
Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica)
igneous
Labradorite (tumbled)
Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)
Mineral
Pearl
Biogenic CaCO3 (Aragonite and Calcite)
mineral
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene)
igneous
Granite
Granite (a common name for a felsic intrusive igneous rock)
Igneous Rock
Diamond
Carbon (C)
mineral
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
Mineral
Amethyst (Quartz)
SiO2 (Silicon Dioxide)
mineral
Gold
Aurum (Elemental Gold, Au)
Mineral, Metal (element)