Weathered quartz-rich rock, likely silicified limestone or quartzite
Microcrystalline quartz (SiO₂), possibly with calcite (CaCO₃) and iron-oxide staining
metamorphic
Category
Mineral_rock
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Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
mineral
Quartz with Iron Oxide Inclusions
Silicon Dioxide (SiO2) with Iron Hydroxide/Oxide (Limonite/Goethite)
mineral
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Schist
Metamorphic Rock (Schist)
metamorphic
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Granite
Granite
igneous
Gneiss (specifically a Granitic Gneiss)
Gneiss (Composition: Quartz, Feldspar, Mica)
metamorphic
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary
Banded Sandstone / Siltstone
Sedimentary Rock (Quartzose Sandstone / Siltstone)
sedimentary
Sandstone
Arenite (SiO2 with various cementing minerals)
sedimentary
Granite
Granite (felsic intrusive igneous rock)
igneous
Mixed river-worn rock and mineral collection
Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble
igneous, sedimentary, metamorphic, mineral
Yellow Topaz
Topaz - Al2SiO4(F,OH)2
gemstone
Amethyst
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst on Basalt
Silicon dioxide (SiO2) with trace Iron
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Orange Quartz (Citrine Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Shale
Laminated Fissile Pelite
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Gemstones (Emerald and Yellow Topaz or Citrine)
Beryl (Be3Al2Si6O18) and Quartz (SiO2) or Topaz (Al2SiO4(F,OH)2)
mineral
Quartz
Silicon dioxide (SiO2)
mineral
Green Aventurine
Quartz variety (SiO2) with fuchsite inclusions
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Limonite (Ironstone)
FeO(OH)·nH2O (Hydrous ferric oxides)
mineral
Magnesite or Howlite with Matrix
Magnesium carbonate (MgCO3) or Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
Mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Specular Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
mineral
Lepidolite
K(Li,Al)3(Al,Si,IV)4O10(F,OH)2
mineral
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite treated with acid
mineral
Quartz Geode or Vein Quartz
Silicon Dioxide (SiO2)
mineral
Quartz-rich pegmatite or quartz vein rock
Mostly quartz (SiO₂), with probable feldspar and iron-oxide staining
igneous
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Unidentified dark reddish-brown rock or mineral specimen
Indeterminate from the blurred image; possibly iron-stained quartz, jasper, or a metallic sulfide-bearing rock
mineral
Quartz-rich rock, possibly milky quartz or quartzite fragment
Quartz (SiO₂), potentially quartzite if metamorphic
mineral
Likely weathered quartz-rich rock, possibly smoky quartz or chert
Quartz (SiO₂), though exact identification is uncertain from the photograph
mineral