Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone Moqui Marble (Concretion)

Iron oxide concretion (Hematite/Goethite and Quartz)

Diamond

Carbon (C)

Sandstone (Ferruginous/Red Sandstone)

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Larimar

Pectolite (Blue variety), NaCa2Si3O10(OH)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Epidote

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

Polished Agate Geode

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Malachite

Copper Carbonate Hydroxide (Cu2CO3(OH)2)

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)

Fossilized Bivalve Shell

Bivalvia (fossil specimen)

Agate

Agate (Cryptocrystalline variety of Quartz, SiO2)

Grey Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

Fluorite Geode

Calcium Fluoride (CaF2)

Quartz

Silicon Dioxide (SiO2)

Chrysocolla (with Quartz and Azurite)

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

Quartz / Quartzite

Silicon Dioxide (SiO2)

Banded Agate

Agate (Silicon Dioxide - SiO2)

Purple Lepidolite with Quartz

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Chert (containing Orbicular/Agate patterns)

Microcrystalline Quartz (SiO2)

River Jasper (Chert/Chalcedony)

Silicon Dioxide (SiO2) with iron oxide impurities

Sandstone (Quartzite-rich River Cobble)

Clastic sedimentary rock (primarily SiO2)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Anthracite Coal with Sulfur staining

Anthracite (Carbon C with impurities)

Chalcedony (River Stone)

Microcrystalline Quartz (SiO2)

Sand (Construction Grade)

Unconsolidated siliciclastic sediment (primarily SiO2)

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

Calcite

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)

Optical Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Sulfide (FeS2)

Amygdaloidal Basalt with Zeolite/Quartz Infill

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

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Sandstone (SiO2 with various trace minerals)

Botryoidal Agate

Silicon Dioxide (SiO2)

Quartz (Microcrystalline Fragment)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon dioxide (SiO2)