Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Sandstone (Ferruginous/Red Sandstone)

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Diamond

Carbon (C)

Larimar

Pectolite (Blue variety), NaCa2Si3O10(OH)

Turquoise

Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O

Turquoise

Hydrous phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Polished Agate Geode

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Epidote

Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Fossilized Bivalve Shell

Bivalvia (fossil specimen)

Agate

Agate (Cryptocrystalline variety of Quartz, SiO2)

Grey Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

Quartz

Silicon Dioxide (SiO2)

Fluorite Geode

Calcium Fluoride (CaF2)

Banded Agate

Agate (Silicon Dioxide - SiO2)

Purple Lepidolite with Quartz

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Chrysocolla (with Quartz and Azurite)

Hydrated copper phyllosilicate mineral [Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)]

Quartz / Quartzite

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

River Jasper (Chert/Chalcedony)

Silicon Dioxide (SiO2) with iron oxide impurities

Chert (containing Orbicular/Agate patterns)

Microcrystalline Quartz (SiO2)

Anthracite Coal with Sulfur staining

Anthracite (Carbon C with impurities)

Sandstone (Quartzite-rich River Cobble)

Clastic sedimentary rock (primarily SiO2)

Limestone

Calcium Carbonate (CaCO3)

Sand (Construction Grade)

Unconsolidated siliciclastic sediment (primarily SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Chalcedony (River Stone)

Microcrystalline Quartz (SiO2)

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Calcite (Yellow/Orange variety - sometimes called Honey Calcite)

Calcite

Amygdaloidal Basalt with Zeolite/Quartz Infill

Amygdaloidal Basalt (Host: (Mg,Fe)2SiO4 / CaAl2Si2O8; Infill: SiO2 or Na2Al2Si3O10·2H2O)

Feldspar (specifically Orthoclase or Plagioclase)

Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate

Tiger's Iron

Pseudomorphic Quartz Aggregate (contains SiO2 with Fe2O3 and FeOOH)

Orange Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Sulfide (FeS2)

Optical Calcite

Calcium Carbonate (CaCO3)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Sandstone (SiO2 with various trace minerals)

Hematite

Iron(III) oxide (Fe2O3)

Quartz (Microcrystalline Fragment)

Silicon Dioxide (SiO2)

Botryoidal Agate

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon dioxide (SiO2)

Plume Agate

Silicon Dioxide (SiO2)

Bloodstone

Chalcedony (cryptocrystalline quartz)