Mineraloid (Human Made Geological Specimen)

Quartz (Yellow/Milky variety)

Silicon Dioxide (SiO2)

Blue Quartz (or Blue Aventurine)

Silicon Dioxide (SiO2) with inclusions (typically Crocidolite or Dumortierite)

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Common Opal

Hydrated silica (SiO2 " nH2O)

Quartz with Mica and Feldspar

Granitic Pegmatite Fragment (SiO2 + KAlSi3O8 + KAl2(AlSi3O10)(OH)2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

White Quartz

Silicon Dioxide (SiO2)

Basalt (Vesicular)

Extrusive mafic igneous rock

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

Dyed Howlite (simulating Lavender/Purple Jade or Charoite)

Howlite: Ca2B5SiO9(OH)5 (when natural)

Mineral

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Serpentinite (probable)

Serpentinite; chiefly serpentine-group minerals, commonly lizardite, chrysotile, or antigorite, with possible magnetite and relict olivine/pyroxene

metamorphic

Milky Quartz with Chlorite/Moss Infusions

Silicon Dioxide (SiO2)

Mineral, specifically a detrital grain

Quartz (likely) or a Quartzite Pebble

Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.

Druzy Quartz

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

metamorphic

Milky quartz

Quartz (silicon dioxide, SiO₂)

Tumbled white quartz or quartzite pebble

Quartz (SiO₂), possibly massive quartzite

Greenstone

Metabasalt / Metavolcanic rock

metamorphic

Granodiorite / Granite (Weathered)

Granodiorite

Igneous

Chert (Common Opal or Chalcedony)

Microcrystalline Quartz (SiO2)

Ocean Jasper

Orbicular Jasper / Silicate

Mineral

Clear Quartz

Silicon Dioxide (SiO2)

Conglomerate / Breccia Matrix (Aggregated Rock)

Sedimentary Breccia / Conglomerate

Granitic Pegmatite with Tourmaline and Sphalerite

Pegmatite containing Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) and Sphalerite ((Zn,Fe)S)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Quartz (Milky or Cloudy)

Silicon Dioxide (SiO2)

Milky Quartz (with potential inclusion)

Silicon Dioxide (SiO2)

Quartz / Common Agate

Silicon Dioxide (SiO2)

Quartz (Milky or Smoky Quartz)

Silicon Dioxide (SiO2)

Crushed Stone / Greywacke

Greywacke (Indurated Sandstone)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Clear)

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Red Jasper

Silicon Dioxide (Microcrystalline Quartz), SiO2

Milky Quartz

Silicon Dioxide (SiO2)

Snowflake Obsidian

Vitreous Volcanic Rock (Amorphous Silicate), SiO2

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Milk or Clear)

Silicon Dioxide (SiO2)