Tektite (Natural Glass)

Weathered quartz-rich pebble

Mostly microcrystalline quartz (SiO₂), possibly quartzite or chalcedony with iron-oxide staining

Tumbled blue-green stone, likely aquamarine-bearing pegmatite or blue apatite

Probable fluorapatite, Ca5(PO4)3(F,Cl,OH), though visual identification is uncertain

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Aragonite Star Cluster

Aragonite (Sputnik habit) - CaesarCO3

Weathered brown rock, likely iron-stained sandstone or chert

Indeterminate; probable quartz-rich sandstone/chert with iron-oxide staining

Pink Granite

Granite (Alkali-feldspar granite)

Granite

Granite (consisting mainly of Quartz, Alkali Feldspar, and Plagioclase)

Polished pale stone, likely limestone or quartzite pebble

Most consistent with micritic limestone (calcite, CaCO₃), though the image cannot confirm mineralogy

Tourmalinated quartz sphere

Quartz (SiO₂) with black schorl tourmaline inclusions

Quartz Pebble (Milky / Clear Quartz)

Silicon Dioxide (SiO2)

White quartz pebble

Quartz (silicon dioxide, SiO₂)

Carnelian (red chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), iron-oxide colored variety

Green beryl (likely aquamarine-grade beryl)

Beryl, Be₃Al₂Si₆O₁₈; blue-green color is caused mainly by iron

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Milky quartz (rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Garden Quartz (Phantom Quartz)

Silicon Dioxide (SiO2) with various inclusions (often Chlorite, Hematite, or Iron)

Turquoise carving

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Red Jasper

Silica (Silicon Dioxide, SiO2) with iron oxide inclusions

Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Jasper with Manganese Dendrites

Silicon Dioxide (SiO2) with Oxide Mineral Inclusions

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartzite Beach Pebble (with Quartz Vein)

SiO2 (Quartzite)

Orange Quartzite (Tumbled Beach Pebble)

Quartzite (primarily SiO2)

Polished jasper/chalcedony pebble

Microcrystalline quartz (SiO₂), likely brecciated or iron-stained jasper

Quartz (Heart-Shaped Pebble)

Silicon Dioxide (SiO2)

Quartz (Citrine or Iron-Stained variety)

Silicon Dioxide (SiO2)

Chert (often found as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Tumbled carnelian (probable)

Cryptocrystalline silica, mainly chalcedony (SiO₂), colored orange-red by iron oxides

Flint or chert

Microcrystalline quartz (SiO₂), commonly called flint when dark and nodular

Amethyst (as part of a multi-stone bracelet)

Silicon Dioxide (SiO2) with iron impurities

Amethyst (Tumbled)

Purple Quartz (SiO2 with iron impurities and irradiation)

Amethyst

Amethyst (Silicon Dioxide, SiO2 with Iron impurities)

Amethyst Cluster

Silicon Dioxide (Quartz variety: Amethyst) - SiO2

Clear Quartz (Faceted) / White Sapphire / Goshenite

Silicon Dioxide (SiO2) / Aluminium Oxide (Al2O3)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Possibly tumbled dark stone or mineral specimen

Indeterminate from image; possibly black tourmaline, basalt, or another dark silicate

Chert or chalcedony fragment

Microcrystalline quartz (SiO₂), possibly jasper or agate

Vesicular basalt (likely weathered lava rock)

Basalt, predominantly calcium-rich plagioclase, pyroxene, and commonly olivine; vesicular texture from gas bubbles

Likely polished garnet fragment

Garnet group, possibly almandine (Fe₃Al₂Si₃O₁₂)

Blue Topaz (specifically London Blue or Swiss Blue based on color saturation)

Al2SiO4(F,OH)2 (Aluminum Silicate Fluoride Hydroxide)

Amethyst Cluster

Silicon Dioxide (SiO2 with iron impurities)