Mineral With Artificial Coating

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Possible iron-rich basalt or slag-like volcanic rock

Basalt, tentatively; mineral composition likely plagioclase, pyroxene, and iron oxides

Quartz Pebble (Iron-stained)

Silicon Dioxide (SiO2)

Iron-stained Quartz

Silicon Dioxide with Limonite (SiO2 + FeO(OH)·nH2O)

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), likely jasper/chert

Blue Agate (Dyed)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Blue Agate (Tumbled and Dyed)

Silicon Dioxide (SiO2) with likely organic dyes

Pink Dyed Agate

Silicon Dioxide (SiO2) - Variety Agate

Rose Quartz

Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese

Vesicular basalt (likely iron-rich scoria)

Basaltic volcanic rock; chiefly plagioclase, clinopyroxene, olivine, and Fe-Ti oxides

Sandstone (Nut-stone / Cup-stone artifact)

Quartz Arenite / Worked Sedimentary Rock

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Iron Oxide staining)

Red Sandstone Pebble

Arenite with Hematite (Fe2O3) cement

Weathered quartz-rich rock fragment

Likely quartz-bearing vein rock, possibly quartzite or silicified breccia; exact identification requires testing

Milky quartz fragment

Quartz (silicon dioxide, SiO₂), likely massive or vein quartz

Milky quartz fragment

Quartz, silicon dioxide (SiO₂)

Quartz crystal fragment in weathered host rock

Quartz (SiO₂), possibly in a feldspathic or iron-stained matrix

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Polished black stone sphere (likely black basalt or black tourmaline)

Most likely fine-grained basalt (plagioclase–pyroxene); mineral identification is uncertain from the image alone

Golden-brown druzy quartz cluster

Quartz, silicon dioxide (SiO₂), likely iron-stained or included with limonite/goethite

Druzy Quartz Geode Fragment

Silicon Dioxide (SiO2)

Diamond Druzy (Crystalline Diamond)

Carbon (C)

Red Quartz (Druzy)

Silicon Dioxide (SiO2) with Hematite inclusions

Ferruginous Quartz

Quartz with Iron Oxide inclusions (SiO2 + Fe2O3)

Ferruginous Quartz

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

Weathered granitic or feldspathic pebble

Likely granite/granodiorite; quartz–feldspar–mica aggregate

Kaolinite (Chalky Clay)

Kaolinite (Al2Si2O5(OH)4)

Iron-rich basalt or weathered ironstone

Basalt, likely variolitic/vesicular and coated with iron oxides; composition mainly plagioclase, pyroxene, and magnetite/hematite

Weathered concrete or cementitious slab (not natural rock)

Artificial calcium-silicate cement composite; likely Portland cement concrete

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Coarse-grained granite or granitic gneiss

Granite; chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende. The pronounced streaking may indicate gneissic deformation.

Quartz cluster, possibly druzy quartz on matrix

Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain

Tumbled fossil-bearing limestone (likely crinoid or shell fragment)

Fossil carbonate; predominantly calcite (CaCO₃)

Weathered basaltic rock

Basalt, likely vesicular or altered basalt

Druzy Quartz

Silicon Dioxide (SiO2)

Concrete-embedded rock fragment, likely weathered granite or gneiss

Probable granitic silicate assemblage: quartz, feldspar, and dark mica/amphibole

Botryoidal chrysocolla with possible malachite and quartz

Chrysocolla, hydrated copper aluminosilicate; commonly intergrown with malachite, Cu₂CO₃(OH)₂, and quartz, SiO₂

Vesicular volcanic scoria (likely basaltic scoria)

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

Smoky quartz crystal

Quartz, silicon dioxide (SiO₂), likely smoky variety

Quartz Druzy on Matrix (with Copper Mineralization)

Silicon Dioxide (SiO2) with Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O)

Yellow Quartz

SiO2 (Silicon Dioxide)