Mineral With Metamorphic Or Sedimentary Host

Quartz Pebble

Silicon Dioxide (SiO2)

Garnet in Matrix

Almandine or Spessartine Garnet in Quartz/Schist Matrix (X3Al2(SiO4)3)

Dyed Agate

Microcrystalline Quartz (SiO2) with artificial pigment

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Green Aventurine (or Xiuyan Jade / Serpentine)

Silicon Dioxide (SiO2) with Fuchsite inclusions or Magnesium Silicate

Pink Feldspar / Rhodochrosite (Tumbled Pink Quartzite)

SiO2 (Quartz) / KAlSi3O8 (Potassium Feldspar)

Chrome Diopside

Magnesium Calcium Silicate (MgCaSi2O6) containing Chromium impurities

Garnet (likely Almandine or Pyrope)

Garnet (Group Name), Fe3Al2(SiO4)3 or Mg3Al2(SiO4)3

Sandstone Concretion

Sedimentary Concretion (Quartz sand bound by mineral cement)

Quartzite with Epidote/Chlorite Inclusion

Metamorphic Quartzite (SiO2 with accessory silicate minerals)

Veined Sandstone with Calcite Veins

Sedimentary sandstone with hydrothermal/mineral veins

Pegmatite (Granitic Pegmatite with Quartz, Mica, and Tourmaline/Biotite)

Pegmatite

Veined Quartzite / Vein-filled Sedimentary Rock

Siliciclastic rock with iron oxide-filled fractures

Green Aventurine

Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Emerald in Matrix (Quartz/Schist)

Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities

Quartz Veined Siltstone

Siltstone with Quartz (SiO2) intrusion

Emerald in Matrix

Beryl (Be3Al2Si6O18)

Veined Pebble (Quartz/Calcite Veined Metamorphic/Sedimentary Rock)

Quartz / Calcite Veined Fault Breccia or Metamorphic Pebble

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) with host rock (often Schist or Basalt)

Yellow Quartzite (River Pebble)

Metamorphic Quartzite (primarily SiO2)

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Beryl (likely Emerald or Aquamarine in matrix)

Beryllium aluminum silicate (Be3Al2Si6O18)

Quartz Vein Rock

Silicon Dioxide (SiO2)

Banded Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded Agate

Silicon dioxide (SiO2)

Prehnite with Epidote and Quartz

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Boxwork Quartz / Septarian Jasper

Boxwork (SiO2 with iron oxide inclusions)

Jadeite (Jade)

NaAlSi2O6 (Sodium Aluminum Silicate)

Quartz vein in Schist

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

Quartz Vein in Schist / Gneiss Metamorphic Matrix

Silicon Dioxide (SiO2) in metamorphic schist host rock

Magnetite / Hematite rich ore

Magnetite (Fe3O4) or Hematite (Fe2O3)

Milky Quartz

Quartz (Silica / Silicon Dioxide), SiO2

Clear Quartz Cluster

Crystalline Silicon Dioxide (SiO2)

Quartz Vein in Schist

Quartz (SiO2) in Mica Schist

Rough Emerald

Emerald (Beryl), Be3Al2(SiO3)6

Mixed polished rock/mineral specimens

Indeterminate from image; likely quartz-bearing material with iron-oxide staining and possibly mica-rich schist

Agate

Agate (Silicon Dioxide, SiO2)

Chrysocolla (on host rock)

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Copper silicate)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Amethyst

Amethyst (Silicon Dioxide, SiO2)