Igneous And Metamorphic Derivative (Weathered)

Granite

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

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Basalt (River Stone/Pebble)

Basalt (Extrusive Igneous Rock)

Epidote

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

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with fossil inclusions

Epidote in Matrix

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

Turquoise

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

Sandstone with Quarzite clasts

Arenite (SiO2 based)

Banded Gneiss

Gneiss (pronounced 'nice')

Vesicular Basalt with Oxidation

Scoriaceous Olivine Basalt (Mafic volcanic rock)

Granitic Gravel Piece

Granite (Felsic Plutonic Rock / SiO2 with Al2O3, K2O, Na2O)

Basalt (with possible iron oxide staining)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Biotite Mica

K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained or Ferruginous)

Silicon Dioxide (SiO2)

Chert Nodule (Fossiliferous Chert)

Microcrystalline Quartz (SiO2)

Yellow Chert

Sedimentary cryptocrystalline quartz (SiO2)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Yellow Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2)

Chert (Nodular or Massive Variety)

Cryptocrystalline Quartz (SiO2)

Mookaite Jasper

Silicon Dioxide (SiO2) - Radiolarite

Chert (Flint variety)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Limonite-pseudomorph after Pyrite (Prophecy Stone)

Goethite and Limonite secondary minerals (FeO(OH)·nH2O) replacing Pyrite (FeS2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Sandstone (with potential Quartzite characteristics)

Clastic sedimentary rock (primarily SiO2)

Corundum (Sapphire/Ruby in Matrix)

Corundum (Al2O3)

Magnetite (Lodestone)

Magnetite (Fe3O4)

Muscovite

Muscovite (KAl2(AlSi3O10)(OH)2)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Muscovite Mica

Muscovite: KAl2(AlSi3O10)(OH)2

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Sodalite

Sodalite Na8(Al6Si6O24)Cl2

Smoky Quartz

Silicon Dioxide (SiO2)

Pyrite in Quartzite/Graphite Matrix

Iron Sulfide (FeS2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(F,OH)2)

Chalcopyrite

Chalcopyrite (CuFeS2)