Likely garnet crystal
Garnet group, possibly almandine (Fe₃Al₂(SiO₄)₃); identification is uncertain from the photo
mineral
Category
Igneous, Sedimentary, Metamorphic, Mineral, Gemstone, Fossil, Or Meteorite
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Clear Quartz (Rock Crystal) Bracelet
Silicon Dioxide (SiO2)
gemstone
Quartz (Milky/Crystalline)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Libyan Desert Glass
Libyan Desert Glass (Tektite / Impact Glass)
meteorite
Quartz (Smoky/Grey variety)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Garnet in Matrix
Almandine or Pyrope Garnet (X3Y2(SiO4)3) in Schist or Eclogite matrix
metamorphic
Likely raw garnet-bearing metamorphic rock
Garnet schist or garnet amphibolite; probable almandine garnet (Fe₃Al₂Si₃O₁₂)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Dendritic Agate
Silicon Dioxide (Chalcedony with manganese or iron oxide inclusions)
gemstone
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Mixed Mineral and Fossil Collection
Multi-specimen assemblage (SiO2, CaCO3, FeS2, etc.)
mineral
Chondrite Meteorite
Ordinary Chondrite (L or H type)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky or Clear variety with inclusions)
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Weathered, iron-stained rock (likely sandstone or breccia)
Indeterminate clastic sedimentary rock; possible ferruginous sandstone or weathered breccia
sedimentary
Faceted Clear Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Fossilized Coral
Rugosa / Scleractinia (silicified or calcified coral)
fossil
Quartz (specifically Milky or Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Olivine
Magnesium Iron Silicate ((Mg, Fe)₂SiO₄)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon dioxide (SiO2)
Mineral
Quartz
Silicon Dioxide (SiO2)
mineral