Serpentine Schist with Quartz Vein
Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).
Metamorphic
Category
Anthropogenic (Man Made Product Subject To Geological Processes)
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Quartzite Cobble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Sea Glass
Man-made vitreous material
mineral
Weathered iron-rich rock, likely limonite/goethite-bearing laterite
Limonite–goethite aggregate, commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)
mineral
Rough Citrine Quartz
Citrine (Silicon Dioxide, SiO2 with iron impurities)
mineral
Quartzite
Metamorphic Quartzite
metamorphic
Pink calcite (likely)
Calcite — calcium carbonate, CaCO₃
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pearl (Biogenic Mineraloid)
Calcium carbonate (CaCO3) primarily as Aragonite
mineral
Quartz (with probable host rock)
Silicon Dioxide (SiO2)
mineral
Quartzite
Recrystallized Silicon Dioxide (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Eclogite
Eclogite (composed primarily of Omphacite and Pyrope Garnet)
metamorphic
Rough Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartz Druze
Silicon Dioxide (SiO2)
mineral
Diamond
Carbon (C)
gemstone
Rhodonite in Matrix
Rhodonite (Manganese Silicate) - (Mn2+,Fe2+,Mg,Ca)SiO3
mineral
Pink Rhodonite
Manganese Silicate (MnSiO3)
mineral
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Lapis lazuli and green-blue chalcedony jewelry
Lapis lazuli: lazurite-bearing metamorphic rock, chiefly lazurite (Na₃Ca(Al₃Si₃O₁₂)S) with calcite and pyrite; second stone: likely chrysoprase or green-blue chalcedony (microcrystalline quartz, SiO₂)
gemstone
Chromium (Chrome)
Chromium (Cr)
mineral
Diamond ring
Diamond, crystalline carbon (C)
gemstone
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Banded Iron Formation (Metamorphosed Jasper/Siltstone)
Ferruginous Quartzite or Jasperoid Siltstone
metamorphic
Sandstone (Ferruginous)
Arenite (Fe2O3 stained)
sedimentary
Lapis Lazuli
Lapis lazuli (a rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Banded Iron Formation (BIF) / Iron Ore
Banded Iron Formation (composed primarily of Hematite (Fe2O3) and Magnetite (Fe3O4) with Quartz/Chert)
sedimentary
Likely obsidian (possibly tektite or slag glass)
Volcanic glass; primarily SiO₂, noncrystalline
igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Mixed Mineral Specimens
Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Banded calcite (travertine or calcite-rich carbonate)
Calcite, CaCO₃; likely banded travertine or recrystallized limestone
sedimentary
Mica Schist
Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Fossiliferous Limestone (Crinoid stem fossils)
Sedimentary Limestone with Crinoidea ossicles
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
mineral