Fairy Stone (Staurolite Cross)
Staurolite (Fe2Al9O6(SiO4)4(O,OH)2)
mineral
Category
Not A Geological Specimen
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Fossilized Oyster in Flint
Gryphaea or Exogyra embedded in SiO2 (Flint/Chert)
fossil
Oak-grain Laminate (Industrial/Decorative Furniture Finish)
Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)
not a rock (synthetic material)
Basalt with Quartz Vein
Mafic volcanic rock with hydrothermal SiO2 filling
igneous
Petrified Wood (Jet or Coalified Wood appearance)
Silicified wood (principally SiO2) or Carbonized Wood
sedimentary
Unidentified pale mineral fragment
Likely quartz or calcite; image resolution prevents confident identification
mineral
Kidney Stone
Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)
mineral
Sandstone / Chert Gravel
SiO2 (Silicon Dioxide based clastic sedimentary rock)
sedimentary
Diamond-set gold ring or ring component
Diamond (crystalline carbon, C); gold alloy setting (Au)
gemstone
Concretion
Septarian Concretion (Fragmentary)
sedimentary
Phantom Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Glauconite (Greensand Articulated Sandstone)
Glauconite ((K, Na)(Fe, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Small weathered rock fragment
Indeterminate; possibly carbonate-rich sandstone or limestone
sedimentary
Exposed bedrock outcrop, likely basaltic volcanic rock
Likely basalt or andesite; exact identification requires a close hand-sample view
igneous
Quartz-veined Sandstone
Quartzite-veined Arenite (SiO2)
sedimentary
Mixed collection of rocks and minerals
Assorted specimens; visible pieces may include quartz, feldspar, jasper, and other common minerals, but individual identification is uncertain from the image
mineral
Conglomerate (Pebble Conglomerate)
Conglomerate
sedimentary
Fossiliferous Sandstone Pebble (with Crinoid / Shell Impression)
Sandstone containing fossiliferous inclusions (SiO2 matrix with calcite/silica cast fossil)
sedimentary
Garnet
Garnet Group (Silicate Minerals), formula varies e.g., Alm: Fe3Al2(SiO4)3
mineral
Desert Rose / Ironstone Concretion
Hematite-cemented quartz concretion
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Quartz Vein Rock
Silicon Dioxide (SiO2) within Host Rock
mineral
Iron-stained weathered rock
Unknown
Unknown (likely sedimentary or metamorphic)
Conglomerate
Polymictic clast-supported conglomerate
sedimentary
Fossilized Shark Tooth (Sand Tiger)
Carcharias taurus (fossil specimen)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Weathered porphyritic volcanic rock (possibly andesite)
Likely porphyritic andesite; exact identification requires closer examination
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Unidentified small mineral specimen
Undetermined from the image
mineral
Quartz pebble or seed/crumb
SiO2 (if quartz)
mineral
Quartz with Chlorite inclusions
SiO2 with (Mg,Fe)3(Si,Al)4O10(OH)2⋅(Mg,Fe)3(OH)6
mineral
Diamond-set gold jewelry piece
Diamond, crystalline carbon (C), mounted in gold alloy
gemstone
Quartz
Silicon Dioxide (SiO2)
mineral
Porphyritic basalt (likely)
Porphyritic basalt; plagioclase-rich volcanic rock, with composition varying by specimen
igneous
Fossilized Brachiopod Shell
Order Spiriferida (likely)
fossil
Copper Ore / Altered Granodiorite
Cupriferous rock with silicate gangue
mineral
Weathered greenish rock fragment
Indeterminate; possibly epidote- or chlorite-bearing altered silicate rock
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary