Mineral, Part Of A Rock

Sandstone Chert Concretion

Silica-cemented Concretion (primarily SiO2)

Serpentinite

Serpentinite (complex silicate minerals including Lizardite, Antigorite, and Chrysotile)

Sunstone (variety of Feldspar)

Oligoclase Sunstone, Plagioclase Feldspar (Na,Ca)Al(Si,Al)Si2O8

Milky Quartz (polished heart)

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Common Milky Quartz)

Silicon Dioxide (SiO2)

Travertine

Calcareous Tufa (CaCO3)

Blue Lace Agate

Cryptocrystalline Quartz (SiO2) with trace minerals

Ruby in Zoisite (Anyolite)

Corundum var. Ruby in Zoisite (Al2O3 + (Ca2Al3(SiO4)3(OH)))

Gneiss

Gneiss (High-grade Metamorphic Rock)

Basalt (with possible mineral veining)

Basalt (Aphanitic Mafic Igneous Rock)

Banded Agate (specifically Carnelian Agate slice)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Vesicular Basalt (Scoria)

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Granite

Phaneritic Plutonic Felsic Rock

Basalt

Extrusive Mafic Igneous Rock

Giallo Ornamental Granite

Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)

Quartz / Calcite Vein Rock

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)

Milky Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Quartz

Quartz (SiO₂)

Carnelian

Carnelian (a variety of Chalcedony, SiO₂)

Marble

Recrystallized Carbonate Rock (CaCO3)

Turquoise and Red Coral

Turquoise: CuAl6(PO4)4(OH)8·4H2O; Red Coral: Corallium rubrum (organic gemstone)

Quartz (specifically Milky or Clear Chunk)

Silicon Dioxide (SiO2)

Granodiorite

Granodiorite (Phaneritic intrusive igneous rock containing Plagioclase, Quartz, and Biotite/Amphibole)

Sandstone (Ferruginous)

Arenite with Iron Oxide (Fe2O3) cement

Rose Quartz

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

Quartz Pebble (River Rock)

Silicon Dioxide (SiO₂)

Quartz (Milky and Smoky variety)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Geode-like)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Sandstone

Sandstone (clastic sedimentary rock, predominantly SiO2)

Limestone with Calcite Veins

Sedimentary Calcium Carbonate (CaCO3)

Bumblebee Jasper

Calcite-bearing Volcanic Tuff containing Sulfur and Arsenic (Orpiment/Realgar)

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Diorite

Intrusive Igneous Rock (Intermediate Composition)

Granite (Weathered)

Granite (Felsic Plutonic Rock)

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Schist

Mica Schist