Sedimentary Rock (Possibly Conglomerate Or Breccia With A Quartz Vein)

Milky Quartz

Silicon Dioxide (SiO2)

Jasper with Quartz Vein

Silicon Dioxide (SiO2) with impurities

Chert (or Flint)

SiO2 (predominantly microcrystalline quartz)

Banded Chert with Quartz Veining

Microcrystalline Quartz (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Sandstone with Quartz Veining

Clastic sedimentary rock (SiO2 dominated)

Jasper

Microcrystalline Quartz (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline quartz (SiO₂), possibly with mica and feldspar

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Galena-bearing sulfide ore

Galena (lead sulfide, PbS), possibly mixed with pyrite or other sulfides

Tumbled or naturally etched mica-rich mineral specimen, likely muscovite

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly phlogopite mica

Small polished dark mineral or gemstone fragment

Indeterminate; possibly smoky quartz, obsidian, or dark tourmaline

Biotite-bearing granite or granitic gneiss

Quartz–feldspar–biotite assemblage; possibly metamorphosed granite (gneiss)

Agatized fossil fragment, possibly silicified coral

Chalcedony (microcrystalline SiO₂) replacing carbonate fossil material

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Black Chert

Chert (microcrystalline quartz)

Clear/White Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Likely galena-bearing ore specimen

Galena (PbS), possibly with quartz or calcite gangue

Weathered sandstone or iron-rich sedimentary fragment

Quartz-rich sandstone, possibly ferruginous sandstone (SiO₂-dominant)

Weathered quartz-rich river cobble, possibly quartzite

Quartzite (mostly microcrystalline SiO₂), tentatively identified

Banded chert or siliceous mudstone

Microcrystalline quartz (chalcedony), SiO₂; possibly ferruginous shale

Pink chalcedony (likely rough agate/chalcedony)

Microcrystalline quartz, SiO₂; chalcedony variety, possibly iron-bearing

Weathered Volcanic Rock (possibly Rhyolite or Andesite Pebble)

Volcanic rock (e.g., Rhyolite or Andesite, specific identification would require thin section analysis or chemical assay). Mineral composition: Primarily feldspars (orthoclase and/or plagioclase), quartz (in rhyolite), micas, amphiboles, and sometimes pyroxenes.

Clear Quartz Crystal

Quartz (Silicon Dioxide - SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Jasper in Quartz / Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Druzy Quartz)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2 with Hematite inclusions)

Jasper and Chalcedony Composite

Silicon Dioxide (SiO2) microcrystalline quartz

Likely petrified wood or silicified fossil fragment

Silicified wood; predominantly microcrystalline quartz (SiO₂)

Pink-and-white quartz-rich rock, likely rose quartz or quartzite

Quartz (SiO₂), possibly rose-quartz-bearing quartzite; minor iron-oxide staining

Red Jasper (possibly Mookaite)

Silicon Dioxide (SiO2) with Hematite inclusions

Chert with Calcite Veining

Microcrystalline Quartz (SiO2) with Calcium Carbonate (CaCO3) veins