Man Made Material (Jewelry, Metal Alloy)

Serpentine

Serpentinite (group of minerals based on (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Serpentine (Serpentinite)

Serpentinite (complex silicate group including lizardite, chrysotile, and antigorite)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Polished gray-green stone, likely serpentine or nephrite jade

Serpentine-group minerals, chiefly antigorite/lizardite; possible nephrite (actinolite–tremolite amphibole)

Possibly tumbled dark stone or mineral specimen

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

Weathered sandstone or arkosic sandstone

Clastic sandstone, likely quartz–feldspar-rich (arkose)

Small polished brown stone

Indeterminate; possibly tumbled jasper, brown agate, or another iron-stained silicate

Weathered basalt or iron-rich volcanic rock

Mafic volcanic rock, likely basalt; exact identification requires testing

Tumbled brown-and-white feldspar-rich stone, likely granite or quartzite

Indeterminate; probably quartz–feldspar aggregate (granite) or quartzite, with iron-oxide staining

Iron-rich quartzite or weathered ironstone

Quartzite dominated by quartz (SiO₂), with iron oxides/hydroxides such as hematite and goethite

Polished blue stone, likely sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue-dyed jasper or lapis lazuli

Weathered quartz-rich metamorphic rock (probable quartzite)

Quartzite; predominantly microcrystalline quartz (SiO₂), with possible mica, feldspar, and iron-oxide impurities

Dark gray chert or flint nodule

Microcrystalline quartz (SiO₂), commonly chalcedony/quartz

Granite or granitic pegmatite fragment

Felsic intrusive rock, chiefly quartz, feldspar, and mica

Milky rose quartz

Quartz, silicon dioxide (SiO₂), pink variety likely colored by trace elements or microscopic inclusions

Baltic Amber

Succinite (Fossilized Resin)

Chert (Red Jasper variant)

Microcrystalline Quartz (SiO2)

Rose Quartz

SiO2 (Silicon Dioxide)

Chert

Cryptocrystalline Quartz (SiO2)

Flowerstone

Porphyritic Basalt or Porphyritic Andesite

Peridot (Olivine)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Siltstone Pebble

Siltstone (composed of microscopic quartz and clay minerals)

Turquoise with Pyrite

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O] with Iron Pyrite (FeS2)

Rose Quartz

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

Lapis Lazuli

Lapis Lazuli (Aggregate primarily of Lazurite: (Na,Ca)8(AlSiO4)6(S,SO4,Cl,1-2) with Calcite and Pyrite)

Chert (often called Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions (K(Al,Cr)2AlSi3O10(OH)2)

Yellow Chert (Jasper)

Microcrystalline Quartz (SiO2)

Oolitic Chert

Oolitic Microcrystalline Quartz (SiO2)

Chert (and Jasper pebble)

Microcrystalline Silica (SiO2)

Porphyritic Basalt (Chinese Writing Stone)

Porphyritic Basalt or Porphyritic Andesite

Milky Quartz

Silicon Dioxide (SiO2)

Blue Quartzite (Aventurine variety)

Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite

Banded Iron Formation (BIF)

Banded Iron Formation containing Hematite (Fe2O3) and Jasper (SiO2)

Agate

Agate (Silicon Dioxide, SiO2)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (SiO2) with fluid inclusions

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in a Geode

Labradorite

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

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)