Obsidian with Spherulitic Devitrification (Snowflake Obsidian/Mahogany related)
Volcanic Glass (70% or more SiO2)
igneous
Category
Carved Stone
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Obsidian with Mahogany Phasing
Volcanic Glass (SiO2 + Fe2O3)
igneous
Ferruginous Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Pink Himalayan Salt (Halite)
Halite - NaCl (Sodium Chloride) with trace Iron Oxide and Magnesium
Mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Carnelian Agate
Carnelian (Silicon Dioxide, SiO2)
mineral
Himalayan Pink Salt
Halite (NaCl)
sedimentary
Selenite (Satin Spar)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Chalcedony (Common Opal variant)
Silicon dioxide (SiO2) with microcrystalline structure
mineral
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)
metamorphic
Red Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
mineral
Granite (weathered/river-tumbled)
Granite (Plutonic Igneous Rock)
Igneous Rock
Anthracite
Anthracite Coal
metamorphic
Anthracite
Anthracite Coal
sedimentary
Pink Banded Onyx (Mexican Onyx / Calcite)
Calcite (CaCO3) - microcrystalline calcium carbonate
sedimentary
Labradorite (tumbled)
Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)
Mineral
Bronzite
(Mg,Fe)SiO3
Mineral
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Chalcedony
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon dioxide (SiO2)
mineral
Labradorite (a variety of Feldspar)
Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)
igneous
Nephrite Jade
Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Lapis Lazuli
Lapis lazuli (Complex silicate mixture including Lazurite, Calcite, and Pyrite)
metamorphic
Anthracite Coal
Anthracite (Carbon Content 86–97%)
metamorphic
Rose Quartz
SiO2 (Silicon Dioxide with trace Titanium, Iron, or Manganese)
mineral
Nephrite Jade
Nephrite (Silicate mineral: Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Anthracite Coal
Anthracite (Carbon based)
metamorphic
Nephrite Jade
Tremolite-Actinolite solid solution Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Nephrite Jade
Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Carnelian (Orange Chalcedony)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Carnelian
Carnelian (variety of Chalcedony, SiO2)
mineral
Shungite
Non-crystalline carbon (Fullerenes)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Raw Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Green Aventurine
Aventurine (variety of Quartz - SiO2)
Mineral_Rock
Orange calcite fragment
Calcite (CaCO₃), likely iron-stained or orange-colored calcite
mineral
Stichtite in Serpentinite (Atlantisite)
Mg6Cr2CO16(OH)16·4H2O in Mg3Si2O5(OH)4
metamorphic