Metamorphic (Altered Igneous Rock)

Gold Ore

Native Gold (Au) in Matrix

Gneiss (specifically a Banded Gneiss pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Red Tiger's Eye beads

Tiger's Eye (variety of Chalcedony, SiO2)

Gneiss

Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Prehnite

Prehnite Ca2Al2Si3O10(OH)2

River Quartz Pitting/Cobble

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Veined Quartz

SiO2 (Silicon Dioxide)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Quartz (on matrix)

Quartz (Silicon Dioxide, SiO₂)

Clear Quartz (or Rock Crystal)

Quartz (SiO₂)

Orthoclase Feldspar (Salmon variety)

Orthoclase, KAlSi3O8

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Basalt

Basalt

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky/Vein Quartz)

Silicon Dioxide (SiO2)

Smoky Quartz (with possible Feldspar inclusions)

Silicon Dioxide (SiO2)

Quartz (Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Quartz (Pebble)

Quartz (SiO₂)

Granitic Gneiss

Gneiss (Complex silicate composition)

Fossil Coral

Coral Limestone (a type of biogenic sedimentary rock)

Milky Quartz (or Iron-Stained Quartz)

Quartz (Silicon Dioxide, SiO2)

Gold Ore in Matrix

Native Gold (Au) in Quartz/Limonite host rock

Garnet Beads

Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)

Gold Ore in Matrix

Native Gold (Au) in Quartz/Host Rock

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Quartz / Calcite Vein Rock

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Bornite

Bornite (Cu5FeS4)

Gneiss

Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica/Amphibole)

Jasper

Silicon Dioxide (SiO2)

Yellow Sapphire or Citrine

Al2O3 (Corundum) or SiO2 (Quartz)

Biotite or Phlogopite Mica

K(Mg,Fe)3(AlSi3O10)(F,OH)2

Granite Gneiss

High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)