Silver (Native Silver/Alloy Specimen)
Ag (Native Silver element), specifically a 90% Ag / 10% Cu alloy
mineral
Category
Not A Geological Specimen
Browse not a geological specimen specimens identified by the Rock Identifier community.
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Quartz pebble with host matrix
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt (River Stone)
Basalt (SiO2 range 45-52%)
igneous
Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Chert (specifically Jasper/Carnelian variety)
Microcrystalline quartz (SiO2)
sedimentary
Quartz Pebble (Citrine-colored or Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Iron-Stained Quartz Pebble
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Jasper and Quartz River Cobble
Silicon Dioxide (SiO2) with Hematite inclusions
Sedimentary / Metamorphic
Bumblebee Jasper
Anhydrite-Aragonite mixture with Orpiment and Realgar
mineraloid
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Calamites (Fossil)
Calamites sp. (Tracheophyta, Equisetopsida)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Green Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Granite
Phaneritic intrusive igneous rock
igneous
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Ferruginous Oxides
mineral
Green glass sphere/marble
Soda-lime glass (primarily SiO2, Na2O, CaO)
Man-made object (Simulant)
Heat-Treated Citrine
Quartz (Silicon Dioxide, SiO2)
mineral
Pegmatitic Granite
Granite (Alkali-feldspar granite) with Quartz and Orthoclase
igneous
Sunstone
Oligoclase (Plagioclase Feldspar) - (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions
mineral
Chert (Common Opal/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Sandstone
Arenite with Iron-oxide cement
sedimentary
Bauxite
Bauxite (mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))
sedimentary
Amber
Succinite (with empirical formula approximately C10H16O)
Organic Mineraloid
Dalmatian Stone
Dalmatian Jasper (a misnomer) / Perthitic Feldspar Rock
igneous
Amber
Succinite (fossilized tree resin)
mineraloid / sedimentary organic material
Mystic Topaz
Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)
mineral
Petrified Wood
Siliconized Wood (SiO2)
sedimentary
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
mineral
Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Strawberry Quartz
Quartz with Hematite inclusions (SiO2 + Fe2O3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral
Ruby Zoisite
Anyolite (Zoisite with Ruby and Pargasite)
metamorphic
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2)
mineral
Amazonite
Microcline (KAlSi3O8) with lead impurities
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Orbicular Jasper (Ocean Jasper variant)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral