Mineraloid (Man Made)

Black Pearl (Tahitian or Irradiated Type)

Organic gemstone (Calcium Carbonate with Conchiolin Binding)

Polished black obsidian pyramid/block

Obsidian — natural volcanic glass, chiefly rhyolitic silica (approximately 70–75% SiO₂)

Cobalt Blue Slag Glass

Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives

Amber

Succinite (fossilized resin)

Amber (with potentially inclusions)

Succinite (Fossilized Tree Resin)

Polished green-gray stone, possibly serpentine

Likely serpentine-group rock, composed mainly of serpentine minerals; identification is uncertain from the photo

Chert / Flint

Chert (varieties include Flint)

Milky quartz (rough fragment)

Quartz, silicon dioxide (SiO₂)

Turquoise ring

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; the setting appears to be silver-colored metal

Amber

Succinite (fossilized tree resin)

Quartz

Silicon Dioxide (SiO₂)

Pearl (Biogenic Mineral)

Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3

Green cabochon gemstone, likely aventurine or dyed chalcedony

Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony

Bumblebee Jasper

Calcite with Arsenic and Sulfur inclusions

Natural White Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3

Obsidian

Volcanic Glass (predominantly SiO2, approximately 70% or more)

Chert (flint), brown variety

Microcrystalline quartz (SiO₂)

Amber

Succinate (Fossilized Tree Resin)

Yellow amber beads

Amber (fossilized tree resin; organic mineraloid, not a true mineral)

Fossiliferous Limestone

Limestone (composed primarily of calcite with included fossils CaCO3)

Mahogany Obsidian

Volcanic glass (SiO2 with Hematite or Magnetite inclusions)

Chert (flint), likely a weathered nodule fragment

Microcrystalline quartz (SiO₂), commonly termed chert or flint

Ironstone pebble

Iron-oxide-cemented sediment, likely hematite- or goethite-rich

Coquina

Bioclastic Limestone

Likely muscovite mica

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Polished hematite (specimen identification uncertain)

Hematite, α-Fe₂O₃

Chalcedony (likely agate)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Tumbled black stone, likely obsidian

Obsidian — volcanic glass, chiefly silica-rich rhyolitic composition

Polished brown jasper (likely iron-rich jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂)

Diamond (Cut Gemstone)

Carbon (C)

Tumbled brown jasper

Microcrystalline quartz (SiO₂), commonly called jasper when opaque and impurity-colored

Polished jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with possible iron-oxide and other mineral inclusions

Chert

Chert (Microcrystalline Quartz)

Quartzite

Metamorphic Quartz Rock (SiO2)

Sandstone

Arenite (mostly SiO2)

Potassium feldspar

Orthoclase or microcline; KAlSi₃O₈

Tumbled yellow chalcedony (possibly citrine or pale agate)

Chalcedony, microcrystalline quartz (SiO₂); exact variety cannot be confirmed visually

Mahogany Obsidian

Volcanic glass containing Hematite or Magnetite (SiO2 + Fe2O3)

Polished sodalite-bearing rock

Likely sodalite in a feldspar-rich host; exact rock identification is uncertain from the image

Quartzite

Metamorphic Quartzite (SiO2)

Cantera Opal (Mexican Fire Opal in Rhyolite Matrix)

Hydrated amorphous silica in rhyolite (SiO2·nH2O in volcanic matrix)