Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Basalt (Road Aggregate)

Basalt (Aphanitic Mafic Igneous Rock)

Porphyritic Basalt (with Pyrolusite or Iron-oxide staining)

Porphyritic Basalt (Mafic Extrusive)

Gold Nugget

Native Gold (Au)

Gold

Native Gold (Au)

Blue Calcite

Calcium Carbonate (CaCO3)

Basalt

Mafic volcanic rock (various silicate minerals including Pyroxene and Plagioclase)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Copper-bearing Quartz (with Malachite and Iron Oxides)

Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)

Chalcedony (Common Opal variant)

Silicon dioxide (SiO2) with varying levels of hydration

Calcite

Calcium Carbonate (CaCO3)

Iron-Stained Quartz Pebble

Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Goethite) inclusions

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with impurities

Chert (specifically Iron-stained River Cobble)

Silicon Dioxide (SiO2)

Limonitic Quartzite

Metamorphosed sandstone with Limonite (FeO(OH)·nH2O) staining

Quartzite

Hydrothermal Quartz or Quartzite (SiO2)

Quartzite (Iron-stained)

Quartzite (mostly SiO2 with Fe2O3 impurities)

Ocean Jasper

Orbicular Jasper/Microcrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Granite Cobble

Phaneritic Felsic Igneous Rock

Riverstone Quartzite (Iron-stained)

Quartzite (primarily SiO2 with Limonite/Goethite staining)

Amygdaloidal Basalt with Epidote/Chlorite

Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with secondary mineral infilling)

Ferruginous Sandstone (with possible Epidote/Chlorite coloring)

Sandstone (SiO2 dominated with Fe2O3 staining)

Granite Pebble

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

Granite or Granodiorite (Weathered)

Granite

Pink Dyed Agate

Chalcedony (SiO2) with artificial dyes

Diamond Druzy (Crystalline Diamond)

Carbon (C)

Yellow Quartz (Citrine appearance)

Silicon Dioxide (SiO2)

Amygdaloidal Basalt with Epidote

Vesicular Basalt with secondary Epidote/Quartz mineral infill

Granite Cobble

Granite (Phaneritic Quartz-Feldspar Felsic Rock)

Bauxite (Concretionary)

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

Red Vanadinite on Matrix

Vanadinite (Pb5(VO4)3Cl)

Ferruginous Quartz

Iron-stained Quartz (SiO2 with Fe2O3 impurities)

Quartz

SiO₂ (Silicon Dioxide)

Sandstone

Arenite (SiO2 based with various mineral cements)

Basalt

Mafic Extrusive Igneous Rock

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Grey Chalcedony

Silicon Dioxide (SiO2)

Bauxite (Aluminum Ore)

Hydrated aluminum oxides, primarily Al(OH)3, AlO(OH)

Red Jasper (Opaque Chalcedony)

Jasper / Silicon Dioxide (SiO2) with Ferric Iron inclusions

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Ferruginous Oxides

Gastly (Trick or Trade Halloween Series)

Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)