Man Made Material (Jewelry, Metal Alloy)

Tiger's Eye and Gemstone Assortment

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Chert (and Jasper variety)

Microcrystalline Quartz (SiO2)

Polished pink feldspar or quartz pebble (uncertain)

Likely microcline feldspar (KAlSi₃O₈) or quartz (SiO₂), with iron-oxide inclusions

Polished green stone, likely serpentine or altered basalt

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing

Polished brown stone, likely smoky quartz or jasper

Tentatively quartz (SiO₂), possibly smoky quartz; exact identification requires testing

Small pale mineral fragment

Unidentified; possibly quartz, calcite, or feldspar

Tumbled tan pebble, likely sandstone or chert

Uncertain; probable quartz-rich sandstone (SiO₂-bearing)

Tumbled orange chalcedony (likely carnelian)

Carnelian, a cryptocrystalline variety of quartz (SiO₂)

Quartz geode

Microcrystalline quartz and drusy quartz (SiO₂), commonly lining a chalcedony-rich cavity

Tumbled quartz pebble

Quartz (SiO₂), likely milky or fractured rock crystal

Tiger’s eye

Chatoyant quartz (fibrous quartz pseudomorph after crocidolite), SiO₂

Blue glass-like gemstone specimen (likely dyed or synthetic quartz)

Uncertain; possibly blue-dyed quartz or synthetic glass, not confidently identifiable from the image

Rough Emerald

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Labradorite (Raw)

(Ca,Na)(Al,Si)4O8

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Unakite (Epidote-Granite)

Unakite (altered granite containing epidote, orthoclase, and quartz)

Chert (Jasper)

Silicon Dioxide (SiO2)

Serpentinite (often called Jade or Nephrite substitute)

Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)

Serpentine

Antigorite, Lizardite, or Chrysotile; Mg3Si2O5(OH)4

Unakite

Unakitized granodiorite / Quartz-Epidote-Feldspar rock

Ocean Jasper

Orbicular Jasper (Silicon Dioxide with impurities), SiO2

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Rose Quartz

Silicon dioxide (SiO2) with trace elements of Titanium, Iron, or Manganese

Biggs Jasper

Cryptocrystalline Quartz (Silicon Dioxide) - SiO2

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Rose Quartz

Quartz (Silicon Dioxide - SiO2)

Quartzite

Quartzite (SiO2)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Jasper

Jasper (Silicon Dioxide, SiO2)

Ferruginous Quartz

Quartz (Silicon Dioxide, SiO2) with iron oxide inclusions

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Black Obsidian

Volcanic Glass (SiO2 with impurities)

Chert (Flint)

Silicon Dioxide (SiO2)

Rose quartz (polished fragment)

Quartz, silicon dioxide (SiO₂), pink variety

Tumbled dark river pebble, probably basalt

Fine-grained mafic volcanic rock, most likely basalt; exact identification requires testing

Likely vesicular basalt (scoria)

Basaltic scoria; chiefly plagioclase, pyroxene, and olivine with vesicles

Likely quartz crystal fragment

Quartz (SiO₂), possibly a small tumbled or cleaved fragment

Quartz geode (likely amethyst-bearing)

Silica geode; quartz, SiO₂, with possible amethyst and minor iron oxides

Polished septarian nodule

Septarian concretion; calcite/aragonite and barite-filled fractures in a carbonate-rich mudstone, commonly with pyrite

Tumbled blue sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Petoskey Stone

Hexagonaria percarinata