Mineralological Specimen

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Lazulite

Magnesium Aluminum Phosphate Hydroxide (MgAl2(PO4)2(OH)2)

Chert (with Quartz Vein)

Microcrystalline silica (SiO2)

Chrysocolla

Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O

Amazonite

Potassium Feldspar (Microcline), K(AlSi3O8)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Epidote with Quartz and Feldspar

Ca2(Al2,Fe3+)(SiO4)3(OH) (Epidote complex)

Yellow Calcite

Calcium Carbonate (CaCO3)

Yooperlite

Fluorescent Sodalite-bearing Syenite

Aura Quartz (Pink/Rose Aura Quartz)

Silicon Dioxide (SiO2) bonded with Platinum and/or Silver

Amazonite

Potassium Feldspar (Microcline), K(AlSi3O8)

Optical Calcite (Iceland Spar)

Calcium Carbonate (CaCO3)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Chert (specifically Red Chert / Jasper nodule)

Silicon dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz (Water-worn pebble)

Silicon Dioxide (SiO2)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Limonite (Iron Ore/Sandstone mixture)

Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Yellow Chert (Gold-toned Jasper)

Silicon Dioxide (SiO2)

Amethyst (Agate/Chalcedony variety)

Silicon Dioxide (SiO2) with iron impurities

Granite Cobble

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Chert (Yellow or Ochre Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (specifically Iron-stained or Jasperoid Chert)

Microcrystalline Quartz (SiO2)

Quartzite (River Pebble)

Metamorphic Quartz (SiO2)

Yellow Quartzite River Stone

Quartzite (primarily SiO2)

Granite Cobble

Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)

Quartz Pebble

Silicon Dioxide (SiO2)

Yellow Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Basalt Pebble

Aphanitic Mafic Igneous Rock

Jasper

Jasper (Silicon Dioxide) - SiO2

Granite Cobble

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

Sandstone (likely Ferruginous)

Arenite (SiO2 based with Fe2O3/FeO(OH) cement)

Agate Geode

Cryptocrystalline Quartz (SiO2)

Quartz Pebble (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Quartz (Milky Quartz / Quartzite)

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite Pebbler

Quartzite (primarily SiO2)

Milky Quartz (with trace inclusions)

Silicon Dioxide (SiO2)

Agate (specifically Carnelian or Honey Agate)

Silicon Dioxide (SiO2)

Basalt River Stone

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)