Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Galena-bearing quartz rock

Galena (PbS) in quartz gangue, likely with minor sulfides and iron oxides

Pyrite with Vesicular Matrix

Iron Disulfide (FeS2)

Likely galena-bearing ore or graphite-rich sulfide fragment

Indeterminate; possibly galena (PbS) with quartz, or graphite-rich schist

Vesicular basalt (likely weathered volcanic rock)

Vesicular basalt; predominantly plagioclase, pyroxene, and possibly olivine, with secondary zeolite or calcite infill

Limonite (Yellow Ochre)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Sandstone (Quartzite texture)

Arenite (SiO2 secondary)

Pyrite in Matrix (likely Quartz or Schist matrix)

Iron Sulfide (FeS2)

Basalt

Basalt; predominantly plagioclase feldspar, pyroxene, and commonly olivine

Limonite (Iron Ore)

Limonite (Iron oxide-hydroxide mixture, FeO(OH)·nH2O)

Quartz pebble

Silicon Dioxide (SiO2)

Blue-gray basalt (likely vesicular basalt)

Basalt; primarily plagioclase feldspar, clinopyroxene, and often olivine or iron oxides

Likely basalt with pale mineral veins or alteration

Basalt; predominantly fine-grained plagioclase–pyroxene rock, possibly with calcite/quartz infill

Limestone with Calcite Crust

Sedimentary Calcium Carbonate (CaCO3)

Weathered river cobble, likely basaltic or andesitic volcanic rock

Fine-grained mafic to intermediate igneous rock; exact identification requires testing

Clear Quartz

Silicon Dioxide (SiO2)

Vesicular basalt (probable)

Basalt; chiefly plagioclase feldspar, clinopyroxene, and iron-rich minerals, with vesicles possibly lined by zeolites or calcite

Brown Chalcedony (Agate/Jasper)

Cryptocrystalline Quartz (SiO2)

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)

Weathered volcanic rock, likely altered basalt

Basaltic rock, probably chlorite–epidote–iron-oxide altered basalt

Vesicular basalt (weathered lava rock)

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine (mafic volcanic rock)

Weathered vesicular volcanic rock, likely basaltic scoria

Vesicular basalt/scoria; chiefly plagioclase, pyroxene, olivine, and volcanic glass

Quartz Pebble

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Vesicular volcanic scoria (likely weathered basaltic scoria)

Scoria; chiefly vesicular basalt, composed mainly of plagioclase, pyroxene, and iron-rich glass

Sandstone with Mineral Veining or Crust

Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)

Limonite (Iron Ore)

Hydrous ferric oxides (FeO(OH)·nH2O)

Rough turquoise-bearing rock (probable turquoise matrix)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a host-rock matrix

Quartz Geode

Silicon Dioxide (SiO2) - Crystalline Quartz

Specular Hematite with Quartz and Limonite

Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)

Basalt (with possible weathering or secondary mineral crust)

Basalt (Aphanitic Mafic Igneous Rock)

Milky quartz with dark mineral veins

Quartz, silicon dioxide (SiO₂), likely massive vein quartz; dark veins may be chlorite, mica, iron/manganese oxides, or a sulfide mineral

Script Jasper

Silicon Dioxide (SiO2) with impurities

Likely ironstone or weathered chert with an iron-oxide spot

Silicified sedimentary rock, possibly ferruginous chert (microcrystalline SiO₂ with Fe oxides)

Turquoise in Matrix

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Sandstone

Arenite (SiO2 based with mineral cements)

Green Moonstone (Garnierite)

Nickel-bearing Magnesium Silicate (often a mix of Serpentine and Talc/Chlorite groups)

Vesicular basalt (likely weathered volcanic scoria)

Basalt; chiefly plagioclase, clinopyroxene, olivine, and volcanic glass

Chert (Vuggy Chert)

Silicon Dioxide (SiO2)

Turquoise

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

Mineral and Rock Collection (Assorted)

Mixed collection including Quartz (SiO2), Jasper (SiO2 with impurities), Rose Quartz, and Aventurine

Limonite (Iron Stone/Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)