Tumbled gray feldspar-rich stone, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, potentially fine-grained granite or quartzite
igneous
Category
Mineral (Silicate Variety)
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Amazonite (microcline feldspar)
K(AlSi3O8) - Potassium Aluminum Silicate
mineral
Garnet (likely Almandine or a blend)
Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.
Mineral
Polished chrysocolla-bearing copper mineral specimen
Chrysocolla, Cu₂H₂Si₂O₅(OH)₄·nH₂O, likely mixed with malachite and limonite/goethite
mineral
Diorite
Phaneritic intermediate plutonic rock
igneous
Jadeite
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Blue Slag Glass
Ferro-silicate glass (Slag)
igneous (man-made/industrial)
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)
Igneous
Weathered mineralized rock fragment
Indeterminate; likely quartz–feldspar-rich lithic material with iron-oxide staining
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with Iron traces)
mineral
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
mineral
Moonstone
Adularia (Potassium Aluminum Silicate, KAlSi3O8)
mineral
Iolite
Cordierite (Magnesium iron aluminium silicate)
mineral
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2) with hematite/limonite inclusions
mineral
Picture Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Peridotite
Ultramafic intrusive igneous rock
igneous
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron oxide staining (SiO2 with Fe2O3)
sedimentary
Coprolite
Fossilized feces (various taxa)
sedimentary
Unidentified gray rock fragment
Indeterminate from image; possibly quartz- or feldspar-rich silicate material
mineral
Basalt
Mafic volcanic rock (various silicate minerals)
igneous
Siltstone
Siltstone (composed of mixed silicate minerals and clay)
sedimentary
Diorite (or Gabbro/Gneiss stream pebble)
Diorite
igneous
Granite
Granite (Plutonic Igneous Rock)
igneous
Ferruginous Sandstone
Arenite with Iron Oxide cement (Fe2O3 / FeO(OH))
sedimentary
Diorite
Intrusive Igneous Diorite
igneous
Pyrite on Quartz
Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Fossilized Coprolite
Coprolite (fossilized feces)
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)
sedimentary
Diorite (Salt and Pepper Rock)
Diorite
igneous
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite Tumbled Chips
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Tumbled Stone
Silicon dioxide / Various silicates
mineral
Glauconitic Sandstone
Glauconitic Sandstone (Quartz with Glauconite)
sedimentary
Pink Quartz / Rose Quartz
Silicon Dioxide (SiO2)
mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Moldavite
Tektite (Natural Silicate Glass)
gemstone