Mineral With Artificial Coating

Dragon Vein Agate (Dyed)

SiO2

Dzi Bead (Agate Bead)

Cryptocrystalline Quartz (SiO2) - Chalcedony/Agate

Ferruginous Quartz (Iron-stained Quartz)

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

Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Aura Quartz

Titanium or Gold bonded Silicon Dioxide (SiO2)

Red Sandstone

Arenite (primarily Quartz with Hematite cement, SiO2 with Fe2O3)

Lemon Quartz

Silicon Dioxide (SiO2)

Peacock Ore

Bornite (Cu5FeS4) with artificially induced tarnish

Sandstone (Pebble)

Sandstone (SiO2 with iron oxide impurities)

Iron-rich weathered pebble (likely limonite/goethite-bearing rock)

Limonite mixture, commonly dominated by goethite (FeO(OH)) and hematite (Fe₂O₃)

Quartz-bearing geode or vuggy quartz specimen

Quartz, silicon dioxide (SiO₂), possibly with chalcedony and iron-oxide staining

Likely chalcopyrite-bearing sulfide ore

Chalcopyrite (CuFeS₂), possibly with pyrite and/or sphalerite

Agate

Banded Chalcedony (SiO2)

Iron-Stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide impurities

Yellow jasper pebble (possibly iron-stained chert)

Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony

Yellow Quartz (possibly dyed)

Silicon Dioxide (SiO2)

Botryoidal chalcedony (possible agate or silica sinter)

Microcrystalline quartz, SiO₂

Red Sandstone

Sandstone (Iron Oxide Rich)

Quartz (likely druzy quartz)

Quartz, silicon dioxide (SiO₂)

Quartz geode cluster

Quartz (SiO₂), likely drusy quartz lining a vug or geode

Quartz vein with specular hematite

Quartz (SiO₂) with hematite (Fe₂O₃), possibly minor goethite or iron oxides

Likely tumbled quartz/chalcedony

Quartz (SiO₂), possibly milky quartz or pale chalcedony

Quartz Druzy (on Geode Fragments)

Silicon Dioxide (SiO2)

Golden Healer Quartz

Silicon Dioxide (SiO2) with limonite/hematite inclusions

Likely copper-bearing rock (oxidized copper ore)

Unidentified copper minerals, possibly malachite and cuprite; the image is insufficient for a precise identification

Raw quartz-bearing rock, possibly iron-stained quartz or pegmatitic quartz

Quartz (SiO₂), likely with iron-oxide staining and associated feldspar or mica

Tumbled chalcedony/quartz (possibly agate)

Microcrystalline quartz, SiO₂; likely chalcedony with iron-oxide staining and minor druzy quartz

Quartz-rich rock, possibly iron-stained quartz or quartzite

Quartz (SiO₂), potentially quartzite with iron-oxide staining

Polished smoky quartz point

Quartz, silicon dioxide (SiO₂), likely smoky variety

Aura Rose Quartz

SiO2 (Silicon Dioxide with Titanium/Gold coating)

Druzy Quartz on Chalcedony Matrix

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Small pale-green mineral fragment

Undetermined; possibly green quartz or calcite

Quartz-rich pegmatite or weathered feldspathic rock

Granite-family pegmatite; likely quartz (SiO₂) with feldspar and mica

Red Sandstone

Arenite (Ferruginous Sandstone)

Likely weathered brown rock fragment

Indeterminate; possibly iron-oxide-stained sandstone or laterite

Mottled quartz pebble

Quartz (SiO₂), likely iron-oxide-stained milky quartz

Iron-Stained Quartz (Red Quartz)

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Pumice or vesicular volcanic rock

Pumice; predominantly volcanic glass (silica-rich, commonly rhyolitic to dacitic)

Vesicular basalt

Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine

Drupa or Druzy Quartz on Geode Fragment

Crystalline Silicon Dioxide (SiO2)

Ferruginous Quartz

Quartz (Silicon Dioxide, SiO2) with Iron Oxide Inclusions