Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Category
Industrial Byproduct (Anthropogenic Rock)
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Quartz with Tourmaline
Silicon Dioxide with Schorl (SiO2 + NaFe3Al6(Si6O18)(BO3)3(OH)4)
mineral
Gold Nugget
Gold (Au)
mineral
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 + Au)
metamorphic
Greenschist
Chlorite schist
metamorphic
Soapstone (Steatite) and Quartz mix
Steatite (Mg3Si4O10(OH)2) and Quartz (SiO2)
metamorphic
Quartz Pebble
Crystalline Silica (SiO2)
sedimentary
Sea Shell Fragment (Calcium Carbonate)
Aragonite / Calcite (CaCO3)
mineral
Diamond or Cubic Zirconia
Carbon (diamond) or Zirconium dioxide (cubic zirconia)
gemstone
Garnet (Almandine)
Almandine Fe3Al2(SiO4)3
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granitic Gravel
Granite (Quartz, Feldspar, and Mica mixture)
igneous
Amber Calcite
Calcium Carbonate (CaCO3)
mineral
Jasper
Jasper (Silica/Silicon Dioxide, SiO2)
sedimentary
Copper Ore (likely Malachite or Chrysocolla staining)
Copper Secondary Mineral (e.g., Cu2CO3(OH)2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Agate (Chert/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Diamond (or Cubic Zirconia)
C (Carbon) or ZrO2 (Zirconium Dioxide)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (mostly SiO2)
Metamorphic
Garnet in Matrix (Schist or Quartz)
Almandine Garnet, Fe3Al2(SiO4)3
metamorphic
Silver (Jewelry Specimen)
Native Silver (Chemical Formula: Ag)
mineral
Quartzite
Quartzite
metamorphic
Marble
Recrystallized Calcite / Metamorphosed Limestone (CaCO3)
metamorphic
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Botryoidal Quartz
Silicon Dioxide (SiO2)
mineral
Corundum (Pink Sapphire / Ruby)
Al2O3 (Aluminum Oxide)
mineral
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)
metamorphic
Milky Quartz with Iron Staining
Crystalline Silicon Dioxide (SiO2)
mineral
Titanium-coated Metal Cube (Man-made Fidget Toy)
Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)
Mineral alternative / Synthetic
Glazed Ceramic Tile
Fused Silicate-Clay composite
Synthetic (Man-made material mimicking natural stone)
Metallic iron meteorite (probable)
Iron meteorite, typically kamacite–taenite (Fe–Ni alloy)
meteorite
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Limestone
Calcitic Limestone (CaCO3)
sedimentary
Blue Cat's Eye Quartz (Heated/Dyed)
Silicon Dioxide (SiO2) with fibrous inclusions
mineral
Mica Sand / Vermiculite
Phyllosilicate group (typically Biotite or Muscovite)
mineral
Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Opalite (Synthetic Moonstone/Opal)
Synthetic Silica Glass
mineraloid (synthetic)
Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) with polymer resins
Sedimentary-like (Industrial Composite)
Frosted Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2
mineral