Man Made Mineral Simulant (Glass)

Quartz (specifically Milky or Clear Quartz)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Clear Quartz Sphere

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO₂)

Milky Quartz

Quartz (Silica - SiO2)

Rose Quartz

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

Tumbled pink quartz (probable rose quartz)

Quartz, silicon dioxide (SiO₂), commonly colored by trace elements and microscopic inclusions

Tumbled yellow quartz (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂); yellow coloration likely from iron impurities

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Iron-Stained Quartz (Red/Hematoid Quartz)

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Smoky Quartz

Silicon Dioxide (SiO2)

Rough Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Chert with Calcite Veins

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions

Tumbled quartz pebble (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Milky Quartz (among River Rock)

Quartz (Silicon Dioxide, SiO2)

Epidosite

Epidosite (Metasomatic rock consisting mainly of Epidote and Quartz)

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Obsidian

Obsidian (volcanic glass; primarily SiO2)

Unidentified translucent mineral fragment, possibly calcite

Calcite (calcium carbonate, CaCO₃), tentative identification

Muscovite (Mica) in Quartz Matrix

Muscovite (KAl2(AlSi3O10)(OH)2) and Quartz (SiO2)

Celadonite in Amygdaloidal Basalt

K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2 (Celadonite mineral) within a Basalt matrix

Weathered green-gray stone, likely serpentinite or chlorite-rich metamorphic rock

Probable serpentinite (antigorite–lizardite), possibly chlorite schist or altered basalt

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Chert (variant of Flint)

Chert (SiO2)

Polished brecciated jasper

Jasper, opaque microcrystalline quartz (SiO₂), likely brecciated jasper with iron-oxide and dark silicate inclusions

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Quartz Mineral

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Fluorite

Calcium Fluoride (CaF2)

Vuggy Quartz on Matrix

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Chalcedony

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Citrine Quartz

Silicon Dioxide (SiO2) with ferric iron impurities

Sandstone (with Concretion)

Arenite / Quartzose Sandstone

Tumbled quartz pebble, likely iron-stained quartz or citrine

Quartz (SiO₂), possibly ferruginous quartz or pale citrine

Smooth river pebble

Indeterminate lithology; likely fine-grained quartz-rich sandstone, siltstone, or weathered chert

Tumbled smoky quartz

Quartz, silicon dioxide (SiO₂), smoky variety

Quartz

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide matrix

Orange Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)