Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Category
Man Made Material
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Gold and Diamond
Native Gold (Au) and Diamond (C)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Serpentine pendant
Serpentinite; chiefly antigorite, lizardite, or chrysotile Mg₃Si₂O₅(OH)₄
metamorphic
Diamond (Faceted Gemstone)
Native Carbon (C)
mineral
Vesicular volcanic rock, possibly weathered basalt or scoria
Basaltic scoria/vesicular basalt; predominantly plagioclase, pyroxene, and iron-titanium oxides
igneous
Rounded basalt pebble
Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with minor olivine or magnetite
igneous
Granite
Plutonic felsic igneous rock
igneous
Granite
Phaneritic plutonic rock (SiO2-rich)
igneous
Granite
Plutonic felsic igneous rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Limestone with Fossil Inclusion
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Flint
Microcrystalline Quartz (SiO2)
sedimentary
Flint (or Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Flint or Common Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Rough Diamond
Diamond (pure carbon, C)
mineral
Quartzite
Quartzite (principally SiO2)
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Likely citrine pendant
Quartz, silicon dioxide (SiO₂), probably heat-treated amethyst or smoky quartz
gemstone
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Orbicular jasper (likely ocean jasper)
Silica-rich microcrystalline quartz/chalcedony with feldspar and accessory minerals; composition varies
mineral
Greenstone (likely serpentinite or greenstone pebble)
Serpentinite-rich ultramafic rock; commonly dominated by serpentine-group minerals, with possible chlorite, actinolite, or magnetite
metamorphic
Dark fine-grained rock, likely basalt
Basalt; chiefly plagioclase feldspar and pyroxene, commonly with olivine and iron oxides
igneous
Black basalt fragment
Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine
igneous
Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Limestone Gravel
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Granite
Felsic Plutonic Rock (primarily SiO2)
igneous
Granite
Phaneritic plutonic rock (Quartz-Alkali Feldspar-Plagioclase)
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, Mica)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Cobalt Blue Slag Glass
Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives
mineraloid
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2
sedimentary
Chert (Arrowhead/Tool variety)
Microcrystalline Quartz (SiO2)
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite
SiO2 (Silicon Dioxide / Metamorphic Quartz)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral