Fossil shell fragment
Indeterminate molluscan bioclast, likely aragonite or calcite
fossil
Category
Igneous, Sedimentary, Metamorphic, Mineral, Gemstone, Fossil, Or Meteorite
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Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Moldavite
Moldavite (Silica-rich glass, SiO2 + Al2O3)
tektite
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Mixed mineral and rock collection
Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))
mineral
Fossil bivalve shell
Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features
fossil
Bronzite
MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)
Mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled quartz-rich rock, possibly calcite or sandstone
Indeterminate from photograph; likely microcrystalline quartz (SiO₂) or calcite (CaCO₃)
mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Peridot
Olivine (Mg, Fe)2SiO4
Mineral
Sedimentary Outcrop (Sandstone/Shale)
Sedimentary bedrock formation (variable composition)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of cellulose)
fossil
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Mica
Mica group (often Muscovite or Biotite)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Weathered iron-rich rock fragment
Indeterminate; likely basaltic or mafic rock with iron-oxide staining
igneous
Beaded Jewelry (Assorted Gemstones)
Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ
Mineral, Jewelry
Garnet (likely Almandine or Pyrope)
Garnet (Group Name), Fe3Al2(SiO4)3 or Mg3Al2(SiO4)3
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Garnet
Garnet Group (Silicate Minerals), formula varies e.g., Alm: Fe3Al2(SiO4)3
mineral
Garnet
Pyrope or Almandine (X3Y2(SiO4)3)
mineral
Dark, weathered rock fragment (possibly basalt or iron-rich stone)
Indeterminate; possible basalt (plagioclase–pyroxene rock)
igneous
Banded gneiss
Gneiss, commonly quartz–feldspar–biotite gneiss
metamorphic
Quartz (Milky and Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Moldavite
Tektite (Natural Silica Glass)
meteorite
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Polished garnet-bearing metamorphic rock
Likely garnet mica schist or garnet-bearing gneiss; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃
metamorphic
Peridot (Olivine)
Olivine ((Mg, Fe)2SiO4)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral