Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Category
Man Made Object (Metalwork)
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Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Specular Hematite (Specularite)
Hematite (Fe2O3)
mineral
Polished banded jasper pebble
Jasper, a microcrystalline quartz variety (SiO₂), with iron-oxide and clay/mineral impurities
mineral
Polished orbicular jasper
Orbicular jasper; microcrystalline quartz (SiO₂) with hematite/goethite and other silicate inclusions
sedimentary
Dalmatian jasper
Dalmatian stone, typically a leucocratic alkali-feldspar-rich porphyritic igneous rock with black arfvedsonite or aegirine inclusions
igneous
Obsidian (likely mahogany or black obsidian)
Volcanic glass; chiefly amorphous SiO₂-rich rhyolitic composition
igneous
Amethyst geode fragment
Quartz, SiO₂; purple color from irradiation-related iron impurities
mineral
Polished carnelian/chalcedony pebble
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony
gemstone
Polished brecciated jasper
Jasper, opaque microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions
gemstone
Polished serpentine pebble
Serpentinite, chiefly serpentine-group minerals (chrysotile, lizardite, antigorite)
metamorphic
Tumbled milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Polished black stone, likely black obsidian
Obsidian (volcanic glass), primarily silica-rich rhyolitic composition
igneous
Tumbled jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
mineral
Tumbled brecciated jasper
Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions
mineral
Tumbled jasper, likely red/brown jasper
Microcrystalline quartz (chalcedony), SiO₂, colored chiefly by iron oxides
mineral
Milky quartz crystal
Quartz, silicon dioxide (SiO₂)
mineral
Polished blue-banded agate slice
Agate (microcrystalline quartz, SiO₂; chiefly chalcedony)
mineral
Selentite
Gypsum (CaSO4·2H2O)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Chalcedony (SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Brecciated Jasper
Silicon dioxide (SiO2) microcrystalline quartz breccia
sedimentary
Lapis Lazuli
(Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2 (Complex silicate rock)
metamorphic
Labradorite (Tumbled)
Labradorite: (Ca, Na)(Al, Si)4O8
mineral
Banded Agate
Silicon Dioxide (SiO2) - Variety Agate
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
gemstone
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Obsidian with Perlitic Crust
Volcanic Glass (SiO2)
igneous
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Agate
Silicon dioxide (SiO2)
mineral
Banded Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Amazonite
Potassium Feldspar (Microcline) - KAlSi3O8
mineral
Amethyst (Digital/Conceptual Representation)
Amethyst (Silicon Dioxide with iron impurities, SiO2)
mineral
Red Moss Agate (Jasper)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Amazonite
Potassium Feldspar (KAlSi3O8)
mineral
Ocean Jasper
Orbicular Jasper, Chalcedony (SiO2)
mineral
Yellow Jade (Nephrite)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Satin Spar (Selenite variant)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Tiger's Eye (Multicolor/Variegated)
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxides)
mineral