Serpentinite
Serpentinite (composed mainly of Serpentine-group minerals: (Mg, Fe)3Si2O5(OH)4)
metamorphic
Category
Man Made Material
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Yellow Diamond (Faceted)
Diamond (pure carbon) with nitrogen impurities, C
mineral
Rough Diamond
Native Carbon (C)
mineral
Rough Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
gemstone
Likely tumbled calcite or pale limestone fragment
Calcite (CaCO₃), possibly microcrystalline limestone
mineral
Diamond
Carbon (C)
gemstone
Light-colored limestone (probable fossiliferous or micritic limestone)
Calcite-rich carbonate rock; predominantly CaCO₃ (calcite)
sedimentary
Coral Fossil (Petrified Coral)
Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)
sedimentary
Diamond (set in jewelry)
Diamond (Carbon, C)
mineral
Likely chert or flint
Microcrystalline quartz (SiO₂), commonly called chert; exact identification requires testing
sedimentary
Chert pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Mahogany Obsidian
Obsidian with Hematite inclusions (SiO2 + Fe2O3)
igneous
Diamond
Carbon (C)
gemstone
Milky rose quartz
Quartz, silicon dioxide (SiO₂), pink variety likely colored by trace elements or microscopic inclusions
mineral
Quartz (Raw Chunk)
Silicon Dioxide (SiO2)
mineral
Rugose Coral (Horn Coral) Fossil
Order Rugosa (likely Grewingkia or Zaphrentis genus)
fossil
Sandstone Flagstone
Arenite (SiO2 with various cementing agents)
sedimentary
Serpentine
Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Chert Nodules
Microcrystalline Quartz (SiO2)
sedimentary
Diamond
Native Carbon (C)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Diamond
Native Carbon (C)
mineral
Tumbled milky quartz
Quartz (SiO₂), likely massive milky quartz
mineral
Milky quartz (rough crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Chert (Nodular)
Cryptocrystalline Quartz (SiO2)
sedimentary
Serpentine
Serpentine group ((Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4)
metamorphic
Quartz geode
Quartz (SiO₂), likely drusy/microcrystalline quartz lining a geode cavity
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Rounded granite cobble
Granite; chiefly quartz, feldspar, and mica/amphibole
igneous
K-Feldspar (Potassium Feldspar)
Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8
mineral
Red Jasper (River Siltstone)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Rose Quartz
Rose Quartz (SiO2)
mineral
Kimberlite
Kimberlite
igneous
Zebra Jasper (Zebra Stone)
Tumbled Silicon Dioxide (SiO2) with impurities
sedimentary
Rough Diamond
Diamond (pure Carbon, C)
mineral
Polished dark green stone, likely nephrite jade or serpentine
Nephrite jade: tremolite–actinolite amphibole, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂; possible serpentine: Mg₃Si₂O₅(OH)₄
metamorphic
Chert (or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate / Chalcedony
Silicon Dioxide (SiO2)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral