Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Quartz Pebble (Iron-stained)

Silicon Dioxide (SiO2)

Chlorastrolite (Greenstone)

Chlorastrolite (Pumpellyite variety), Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2·H2O

Basalt (Weathered Pebble)

Extrusive mafic igneous rock; minerals primarily Plagioclase feldspar and Pyroxene

Milky Quartz (Water-Worn Pebble)

Quartz (Silicon Dioxide, SiO2)

Kimberlite

Kimberlite (Potassic ultramafic volcanic rock)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)

Calcite

Chrysocolla

Hydrated copper silicates (Cu,Al)2H2Si2O5(OH)4·nH2O

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide) - SiO2

Gold Nugget

Native Gold (Au)

Sandstone (with Lichen)

Arenite (primarily SiO2)

Green Apophyllite

Fluorapophyllite-(K), KCa4(Si8O20)(F,OH)·8H2O

Bauxite

Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)

Agate Geode

Silicon Dioxide (SiO2) - variety Chalcedony/Quartz

Limonite Concretion

Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O

Chrysocolla in Matrix

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Silicate/Secondary Copper Mineral)

Limonite Sandstone

Ferruginous Sandstone (Hydrated Iron Oxide)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Prasiolite

Silicon Dioxide (SiO2) with iron impurities

Rhodochrosite in Quartz

Manganese Carbonate (MnCO3)

Basalt (with possible quartz veinsing)

Basalt

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Fossilized Bone Fragment

Permineralized Skeletal Element (Likely Vertebrate)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Quartz Geode (with possible Manganese or Goethite coating)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Azurite with Malachite and Limonite

Azurite Cu3(CO3)2(OH)2 / Malachite Cu2CO3(OH)2

Granite

Granite (Felsic Plutonic Rock)

Banded Agate Geode (with Microcrystalline Quartz)

Silicon Dioxide (SiO2) - variety Chalcedony/Agate

Granite Cobble

Granite (Phaneritic Igneous Rock)

Basalt with Quartz/Epidote Vein

Mafic volcanic rock (formula primarily (Mg, Fe)2SiO4 and CaAl2Si2O8)

Sandstone Chert Concretion

Silica-cemented Concretion (primarily SiO2)

Limonite / Ironstone Nodule

Limonite (Hydrated iron(III) oxide-hydroxide), FeO(OH)·nH2O

Granite (Weathered/Oxidized)

Phaneritic Felsic Igneous Rock (composed of Quartz, Orthoclase Feldspar, and Mica)

Quartz Pebble

Silicon Dioxide (SiO2)

Ferruginous Sandstone

Arenite with Iron-Oxide cement (Fe2O3 · nH2O)

Sandstone (Micaceous Sandstone)

Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Basalt (with possible mineral veining)

Basalt (Aphanitic Mafic Igneous Rock)

Turquoise

Turquoise (Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O)