Metamorphic (Low Grade)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Nephrite Jade (or Serpentine)

Nephrite (a variety of amphibole mineral tremolite-actinolite) or Serpentine Group minerals

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2 with iron inclusions)

Green Aventurine

Silicon Dioxide (SiO2) with Chromium-rich Fuchsite mica inclusions

Jade

Jade can refer to two distinct minerals: Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (Na(Al,Fe3+)Si2O6). Based on the image, showing a relatively uniform green color and possibly slight translucence in bead form, it is very likely one of these, but determining which one from a photo is difficult without specific testing.

Kyanite

Kyanite (Al2SiO5)

Quartzite

Quartzite (primarily SiO2)

Anthracite Coal

Anthracite

Ruby in Zoisite (Anyolite)

Anyolite (Combination of Corundum and Zoisite)

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F

Quartz (Milky or Cloudy variety)

Silicon Dioxide (SiO2)

Serpentinite

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

Aquamarine

Beryllium aluminum silicate (Be3Al2Si6O18)

Mica Schist with Pyrite

Muscovite/Biotite Schist with Iron Sulfide (FeS2)

Garnet

Garnet group (X3Y2(SiO4)3)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Quartzite (primarily SiO2)

Green Fluorite

Calcium Fluoride (CaF2)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Yellow Sapphire (Corundum)

Corundum (Aluminum Oxide, Al2O3)

Peacock Ore

Bornite (Cu5FeS4)

Schist

Mica Schist (primarily Muscovite and Quartz)

Gneiss (specifically a weathered or stream-worn specimen)

Gneiss (Foliated Metamorphic Rock)

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Petrified Wood

Silicified Wood (primarily Quartz / Chalcedony: SiO2)

Pyrite in Matrix (Fool's Gold)

Iron Sulfide (FeS2)

Beryl (Emerald Variety)

Beryllium aluminum silicate (Be3Al2(SiO3)6) with chromium/vanadium traces

Rutilated Quartz

Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions

Quartz Crystal Point

Silicon Dioxide (SiO2)

Specular Hematite (Specularite) in Matrix

Specularite (Fe2O3)

Pyrite

Iron Sulfide (FeS2)

Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

Nephrite Jade

Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2

Bornite

Bornite (Cu5FeS4)

Shale

Shale (comprised mostly of clay minerals and quartz)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Mica Schist

Mica Schist (with Muscovite)

Schist/Phyllite

Metamorphic Schist (Chlorite Schist variety)

Anthracite Coal

Anthracite

Schist (Oxidized)

Mica Schist with Iron Oxide staining

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Rough Green Fluorite

Fluorite (Calcium Fluoride - CaF2)