Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Not A Geological Specimen
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Conglomerate
Polymictic Conglomerate
sedimentary
Quartz Crystal with Inclusions
Silicon Dioxide (SiO2)
mineral
Synthetic Resin / Plastic Figurine
Synthetic Polymer (Copolymer of Polyethylene or Resin)
Mineraloid-like Synthetic Material
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Porphyritic Basalt (Drill Core)
Porphyritic Basalt with Plagioclase Phenocrysts
igneous
Optical Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
River Pebble (Gneiss or Quartzite variant)
Course-grained Metamorphic Rock (likely SiO2 dominant)
metamorphic
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Quartzite (River Stone)
Quartzite (SiO2)
metamorphic
Granitic Pegmatite (Muscovite and Quartz)
Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)
igneous
Placer Gold Nugget
Native Gold (Au)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Fossiliferous Limestone with Crinoid Stem Impression
Calcium Carbonate (CaCO3) matrix with Crinoidea fossil
sedimentary
Plagioclase Feldspar
NaAlSi3O8 – CaAlSi2O8 (Sodium-Calcium Aluminum Silicates)
mineral
Calcite (Yellow/Orange variety - sometimes called Honey Calcite)
Calcite
Mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz-Veined Basalt River Stone
Basalt with milky quartz (SiO2) vein
igneous
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone
Arenite with Hematite/Limonite cement (SiO2 + Fe2O3)
sedimentary
Opalite (Man-made Glass)
Fused glass (typically made of dolomite and metal opacifiers)
Man-made Material / Glass
Ammonite Fossil (Polished Half / Cleoniceras)
Ammonoidea (Subclass), often Cleoniceras genus; fossilized with Calcite (CaCO3) and Aragonite
Sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Granite fragment
Phaneritic Igneous Rock (Granitic composition)
igneous
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Geode with Quartz and Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz (with Iron Oxide staining)
Quartz (Silicon Dioxide - SiO2)
mineral
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Quartz (Clear or Smoky)
Silicon Dioxide (SiO2)
mineral
Milky Quartz (with potential inclusion of feldspar)
Silicon Dioxide (SiO2)
Mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Rutilated Quartz
Silicon Dioxide with Titanium Dioxide (SiO2 with TiO2 inclusions)
mineral
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F
mineral
Chalcedony (Common Opal variant)
Silicon dioxide (SiO2) with microcrystalline structure
mineral