Mineral Based Alloy (Anthropogenic)

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Iron-Stained Quartzite

Recrystallized Meta-Quartzite (primarily SiO2)

Quartz-veined Basalt

Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein

Mica Schist

Mica Schist (primarily Muscovite and Biotite phyllosilicates)

Lapis Lazuli

Complex mixture of minerals, primarily Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Gneiss (with Mica and Quartz)

Gneissic Metamorphic Rock

Diorite

Diorite (Intermediate intrusive igneous rock)

Basalt with vesicles

Vesicular Basalt

Crushed Stone (Basalt/Gabbro)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Fossiliferous Limestone (Shell Fragment)

Biogenic Limestone (Calcium Carbonate / CaCO3)

Pink Granite

Granite (Phaneritic igneous rock)

Granite

Phaneritic plutonic rock (composed of Quartz, Feldspar, and Mica/Amphibole)

Basalt

Mafic volcanic rock, primarily composed of Plagioclase, Pyroxene, and Olivine

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Sandstone (Cross-bedded Drill Core)

Clastic Sedimentary Rock (primarily SiO2)

Basalt (Greenstone)

Amygdaloidal Basalt / Chloritized Basalt

Basalt with Quartz/Calcite Vein

Amygdaloidal Basalt (matrix) with Mineral Vein filling

Basalt with Scoria/Vesicular Texture

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Banded Gneiss

Gneiss (Metamorphic Rock)

Unknown Rock Specimen

Aquamarine

Beryl (Be3Al2Si6O18), specifically the blue-green variety

Diorite (with Iron Staining)

Phaneritic Intermediate Igneous Rock

Basalt with Desert Varnish

Mafic Volcanic Rock (Fe/Mg rich Silicate)

Chert (often called Flint or Jasper based on color)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper based on color)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper based on color)

Microcrystalline Silica (SiO2)

Bloodstone

Heliotrope (cryptocrystalline Quartz, SiO2 with inclusions of Hematite)

Kambaba Jasper

Stromatolite (Fossilized Algae)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz - SiO2)

Granite

Granite (composed primarily of Quartz SiO2, Alkali Feldspar KAlSi3O8, and Plagioclase Feldspar)

Basalt

Vesicular Basalt (Mafic volcanic rock)

Limonitic Scoria (Vesicular Basalt with Iron Staining)

Highly vesicular basalt heavily stained by Limonite [FeO(OH)·nH2O]

Granite (specifically Pink or Red Granite)

Phaneritic Felsic Igneous Rock (Granite)

Aquamarine and clear quartz

Aquamarine (Be3Al2Si6O18), Quartz (SiO2)

Granite

Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Diorite (Salt and Pepper Rock)

Phaneritic Plutonic Diorite; chemical composition roughly 52-63% silica (SiO2)

Limestone

Calcareous sedimentary rock (CaCO3)

Andesite River Stones

Andesite

Coquina (Fossiliferous Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Granite (Weathered)

Grano-diorite / Granite (SiO2 rich intrusive rock)

Vesicular Basalt

Extrusive Mafic Igneous Rock (Vesicular Basalt)