Man Made Object (Metalwork)

Tumbled zebra calcite (likely calcite marble)

Calcite, CaCO₃; commonly recrystallized limestone/marble with dark graphite- or carbon-rich bands

Tumbled green stone, likely serpentine or nephrite jade

Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite, a jade variety of tremolite–actinolite

Likely polished leopard-skin jasper or brecciated jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions; exact variety cannot be confirmed from the image alone

Obsidian

Volcanic glass (Amorphous silicon dioxide)

Green Aventurine (likely)

Silicon dioxide (SiO2) with fuchsitemica inclusions

Chalcedony (variations like Agate or Jasper)

Chalcedony (SiO₂ - microcrystalline quartz)

Carnelian

SiO2 (Silicon Dioxide) - Translucent reddish-brown variety of Chalcedony

Nephrite Jade

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

Kambaba Jasper

Stromatolite (Fossilized Algae)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Jasper (specifically Fancy or Polychrome Jasper)

Silicon Dioxide (SiO2) - Chalcedony

Howlite (Tumbled)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Tumbled amethyst with possible lepidolite/colored quartz companion

Amethyst, purple quartz (SiO₂), likely with iron-related color centers

Obsidian (black volcanic glass)

Obsidian; primarily amorphous SiO₂-rich rhyolitic glass

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Likely obsidian (possibly tektite or slag glass)

Volcanic glass; primarily SiO₂, noncrystalline

Howlite

Hydrated calcium boro-silicate (Ca2B5SiO9(OH)5)

Obsidian

Volcanic Glass

Red Jasper

Jasper (SiO2, Silicon Dioxide with Iron inclusions)

Rose Quartz

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

Bronzite

(Mg,Fe)SiO3

Citrine

Quartz (SiO₂)

Rhodonite

Rhodonite (MnSiO3)

Jade

Jadeite or Nephrite (both are commonly referred to as 'jade'). Jadeite: NaAlSi2O6; Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2.

Banded Onyx (Green Onyx)

Banded Calcite or Travertine (CaCO3)

Mahogany Obsidian

Obsidian (volcanic glass with Hematite/Magnetite inclusions)

Howlite

Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)

Brown Jasper

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Obsidian

Obsidian (volcanic glass, amorphous silica rich rock)

BROWN GRANITE (likely 'Tan Brown' or similar)

Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)

Limonite (Iron Ore)

Hydrous Iron Oxide (goethite, lepidocrocite)

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Granite, possibly granodiorite

Coarse-grained felsic plutonic rock; chiefly quartz (SiO₂), potassium feldspar and plagioclase feldspar, with biotite and/or hornblende

Yellow calcite (tumbled honey or lemon calcite)

Calcite, calcium carbonate (CaCO₃), likely a yellow/orange calcite variety

Goldstone

Not a natural mineral or rock. It is an ornamental glass.

Banded Jasper

Silicon Dioxide (SiO2)

Sodalite

Sodalite (Na4Al3Si3O12Cl)

Blue Agate (Dyed)

Silicon Dioxide (SiO2)

Red jasper (likely iron-rich chalcedony/jasper)

Jasper, microcrystalline quartz (SiO₂), colored mainly by hematite/goethite