Mixed (Predominantly Sedimentary And Igneous)

Zircon

Zircon (ZrSiO4)

Greisen (Quartz-Muscovite-Turretine Rock)

Greisen

Metamorphic Rock

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Quartz

Quartz (SiO₂)

Rutilated Quartz (beads)

SiO2 with TiO2 inclusions (Titanium Dioxide inclusions within Quartz)

Mineral (specifically a gemstone variety)

Tiger's Eye

Tiger's Eye (a variety of Quartz, SiO₂)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Quartz

Quartz (SiO₂)

Pebble (Likely Basalt or Siltstone)

Clastic sedimentary rock or mafic volcanic rock

Igneous or Sedimentary

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2) with various iron-oxide inclusions

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

Mineral, Jewelry

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Gneiss (Metamorphic Rock)

Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)

Quartz

Silicon dioxide (SiO2)

Clear Quartz (beads in a bracelet)

Quartz (SiO2)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Wishing Stone (Basalt or Mudstone with Quartz/Calcite Veins)

Hydrothermally veined Basalt (SiO2/CaCO3 intrusions)

igneous or sedimentary

Black Chert

Chert (microcrystalline quartz)

Quartz

Silicon Dioxide (SiO₂)

Quartz (likely Milky Quartz or Chalcedony)

Quartz (SiO2 - Silicon Dioxide)

Quartz

Quartz (Silicon Dioxide - SiO2)

Quartz (likely a clear or rock crystal variety)

Quartz (SiO2 - Silicon Dioxide)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Gneiss

Green Aventurine and Clear Quartz

Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Biotite Mica

Biotite, K(Mg,Fe)3AlSi3O10(F,OH)2

Quartz (vein quartz)

SiO2 (Silicon Dioxide)

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

River Pebble (Basalt/Greywacke)

Weathered Basalt or Fine-Grained Greywacke

igneous/sedimentary

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Pyrite

Pyrite (Iron Disulfide), FeS2

Quartz

Silicon dioxide (SiO₂)

Milky Quartz

Quartz (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.

Cat's Eye Shell (Shiva Shell)

Operculum of the Turbo petholatus (Tapestry Turban Snail), predominantly Calcium Carbonate (Aragonite)

mineraloid / biogenic specimen

Mica Group Minerals

There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).

Aquamarine

Aquamarine (Beryl variety); Be3Al2Si6O18

Dyed Howlite (simulating Lavender/Purple Jade or Charoite)

Howlite: Ca2B5SiO9(OH)5 (when natural)