Likely weathered brown rock fragment
Indeterminate; possibly basaltic or iron-stained mafic rock
igneous
Category
Anthropogenic (Man Made Industrial Byproduct)
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Diamond (or diamond simulant)
C
gemstone
Quartz (Microcrystalline/Chert)
Silicon Dioxide (SiO2)
mineral
Pearls (likely freshwater cultured pearls)
Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin
gemstone
Bauxite
Bauxite (principal ore of aluminum, primarily Al(OH)3)
sedimentary
Serpentine
Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)
metamorphic
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C)
gemstone
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Banded Agate (Brazilian Agate Slice)
Chalcedony (Silicon Dioxide / SiO2)
Mineral
Quartzite (River Stone)
Quartzite (SiO2)
metamorphic
Pearl (Biogenic Mineraloid)
Calcium carbonate (Aragonite) and Conchiolin, CaCO3
mineral
Coquina / Fossiliferous Limestone
Fossiliferous Limestone (Calcite, CaCO3)
sedimentary
Flint
Silicon Dioxide (SiO2) - Chert variety
sedimentary
Chert (variations include Flint/Novaculite)
Chert (formula: SiO2)
sedimentary
Chert (often called Flint for darker varieties)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
![Turquoise (Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]) — mineral](https://media.rockidentification.com/92ebc6b5-08ac-4229-a727-57a096ec7f2c-thumbnail.jpg)
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
mineral
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Polished serpentine pendulum
Serpentine-group minerals, chiefly antigorite/lizardite; approximate formula Mg₃Si₂O₅(OH)₄
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Vesicular basalt (likely weathered lava rock)
Vesicular basalt; primarily plagioclase feldspar, pyroxene, and volcanic glass, with possible iron-oxide alteration
igneous
Pyrite
Iron Disulfide (FeS2)
mineral
Textile (Upholstery Fabric)
Woven Polyethylene/Polyester or Cotton Blend
Synthetic or Natural Fiber
Hematite Nodule
Hematite (Alpha Fe2O3)
mineral
Diamond (or Cubic Zirconia)
Cubic Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Agate Geode
Chalcedony (SiO2 - Silicon Dioxide)
sedimentary (secondary mineral formation)
Quartzite
Quartzite (SiO2)
metamorphic
Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.
SiO2 (Silicon Dioxide)
Mineral or Sedimentary (if chert)
Porphyritic Basalt (likely artificially dyed or altered)
Basalt with plagioclase phenocrysts (likely treated)
igneous
Diamond
C
gemstone
Diamond (or Diamond Simulant)
C (Carbon) or synthetic equivalent
gemstone
Portable Ceramic Space Heater
Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements
not a rock (synthetic/industrial object)
Coal
Combustible sedimentary rock
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Lapis lazuli and green-blue chalcedony jewelry
Lapis lazuli: lazurite-bearing metamorphic rock, chiefly lazurite (Na₃Ca(Al₃Si₃O₁₂)S) with calcite and pyrite; second stone: likely chrysoprase or green-blue chalcedony (microcrystalline quartz, SiO₂)
gemstone
Chert (or Flint)
Chert (cryptocrystalline quartz), SiO2
Sedimentary
Coal
Biogenic sedimentary rock (Carbon)
sedimentary
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Planet Earth
Gaia (Silicate Terrestrial Planet)
metamorphic
Chert / Green Jasper
Silicon Dioxide (SiO2)
sedimentary
Diamond
C
gemstone