Tumbled green jasper (probable)
Jasper, opaque microcrystalline quartz (SiO₂), colored by iron and other impurities
mineral
Category
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Tumbled brown jasper (likely iron-rich chalcedony)
Jasper, opaque microcrystalline quartz (SiO₂), commonly colored by iron oxides
mineral
Dalmatian jasper
Orbicular microcrystalline quartz rock, commonly rhyolitic or volcanic-feldspar matrix with black arfvedsonite/alkali-amphibole inclusions
igneous
Tumbled amethyst
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
mineral
Blue-green turquoise-like tumbled stone
Turquoise, hydrous copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Brecciated jasper (likely ocean jasper or rhyolitic jasper)
Silica-rich volcanic breccia composed mainly of microcrystalline quartz/chalcedony (SiO₂), with iron-oxide staining and possible feldspar
igneous
Tumbled dark red-brown stone, possibly jasper
Likely opaque microcrystalline quartz (chalcedony/jasper), SiO₂; exact identification is uncertain from the blurred photograph
gemstone
Tumbled jasper (likely brecciated or orbicular jasper)
Microcrystalline quartz (SiO₂), with iron-oxide inclusions
mineral
Flint
SiO2 (Cryptocrystalline Quartz / Chert)
sedimentary
Polished blue labradorite
Labradorite, calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Quartz), SiO2
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Tumbled ocean jasper or orbicular jasper
Microcrystalline quartz (SiO₂), commonly with chalcedony, feldspar, and iron-oxide inclusions
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Amber
Fossilized tree resin (Amorphous organic polymer)
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Hematite
Iron(III) oxide (Fe2O3)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Argillite
Argillite (Fine-grained sedimentary rock composed mostly of clay-sized particles)
sedimentary
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Satin Spar Gypsum (Selenite Wand)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
gemstone
Amber
Amber (Fossilized Tree Resin)
mineral
Pink Dyed Agate (Pink Agate Slice)
Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz
mineral
Ruby Fuchsite / Ruby in Fuchsite
Ruby (Al2O3 variety corundum) and Fuchsite (K(Al,Cr)2AlSi3O10(OH)2 - a chromium-rich variety of muscovite mica) in Quartz matrix
Mineral
Red Jasper (Skull Carving)
Jasper (Silicon Dioxide, SiO2 plus Iron Oxide inclusions)
sedimentary
Agate
Agate (Silicon Dioxide, SiO2)
mineral
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Mahogany Obsidian
Volcanic glass containing Magnetite/Hematite
igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Amber
Succinates (Organic Fossilized Resin)
mineraloid
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Diamond (or Diamond Simulant)
Carbon (C)
mineral
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Tektite
Impactite (Natural Silicate Glass)
meteorite
Chert (Flint)
Chert (Microcrystalline or cryptocrystalline Quartz - SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Pink Marble
Recrystallized Limestone (Calcium Carbonate, CaCO3)
metamorphic