Quartz Vein in Host Rock
Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)
metamorphic
Category
Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)
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Native Copper in Basalt
Cuprum (with Host Basalt)
igneous
Corundum (Ruby Variety)
Corundum (Al2O3)
mineral
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Asphalt (Bituminous pavement fragment)
Artificial conglomerate / Bitumen-Aggregate mixture
sedimentary
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite treated with acid
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Red Garnet
Pyrope or Almandine (Silicate group, X3Y2(SiO4)3)
Mineral
Quartz with Mica inclusions (likely Iron-stained)
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Limonite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Smoky Quartz with Feldspar
Quartz (SiO2) with Potassium Feldspar (KAlSi3O8)
mineral
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)
sedimentary
Rough Corundum (Sapphire/Ruby mixture)
Corundum (Aluminum Oxide, Al2O3)
mineral
Snowflake Obsidian
Vitreous Silica with Spherulite inclusions (Amorphous SiO2)
igneous
Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Granitic Pegmatite
Pegmatitic Granite
igneous
Mixed Quartz Bracelet (Rose Quartz and Larimar-colored beads)
Silicon Dioxide (SiO2) with various inclusions
mineral
Native Copper
Native Copper (Cu)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Sandstone (Banded)
Clastic Sedimentary Rock (composed of SiO2, CaCO3, or Fe2O3 cement)
sedimentary
Serpentinite
Serpentinite (composed largely of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)
metamorphic
Garnet (Almandine variety)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Rough Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Blue Topaz
Al2SiO4(F,OH)2 (Aluminum silicate fluoride hydroxide)
gemstone
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
River Stone (likely Basalt or Greywacke)
Basalt with mineral veining
igneous
Note: Item is not a geological specimen
Guitar Components (Steel, Nickel, Plastic, Wood)
Synthetic/Consumer Product
Limonite (Ironstone)
Limonite (FeO(OH)·nH2O)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite (potentially Hematite-rich)
Magnetite (Fe3O4)
mineral
Rough Quartz (var. Citrine or Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic Glass (spherulitic obsidian)
igneous
Vanadinite
Lead Chlorovanadate, Pb5(VO4)3Cl
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)
mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Fe2O3)
mineral
Silver Sheen Obsidian
Volcanic Glass (Amorphous Silicon Dioxide - SiO2 with impurities)
igneous
Shale
Laminated Mudstone (Shale)
sedimentary