Milky Quartz with Iron Staining and Matrix

Silicon Dioxide (SiO2)

mineral

Orange Quartzite (with Iron Staining)

Quartzite (SiO2)

metamorphic

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Yellow Aventurine (Yellow Quartzite)

Silicon Dioxide (SiO2) with inclusions

metamorphic

Concrete with Exposed Aggregate

Anthropogenic conglomerate (Concrete)

man-made rock (sedimentary analogue)

Smoky Quartz

Silicon Dioxide (SiO2)

mineral

Marble (Carrara Marble style)

Recrystallized Calcite (CaCO3)

metamorphic

Chalk

Micrite (primarily Calcium Carbonate, CaCO3)

sedimentary

Rose Quartz

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

mineral

Tiger's Eye (Blue/Black variety, also known as Hawk's Eye)

Silicified Crocidolite (Silicon Dioxide with inclusions, SiO2)

metamorphic

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

sedimentary

Milky Quartz / Rose Quartz fragment

Silicon Dioxide (SiO2)

mineral

Quartz

Silicon Dioxide (SiO2)

mineral

Sandstone (Red)

Arenite (primarily Quartz, SiO2, with Iron Oxide cement)

sedimentary

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese

mineral

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

igneous

Geode (Chert or Quartz Nodule)

Silicon Dioxide (SiO2)

sedimentary

Pumice

Pumice (a highly vesicular volcanic rock)

igneous

Pyrite (on Quartz matrix)

Iron Disulfide (FeS2)

mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

metamorphic

Tiger's Eye

Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2

metamorphic

Fluorite

Calcium Fluoride (CaF2)

mineral

Chert (Common Opal variant)

Silicon Dioxide (SiO2)

sedimentary

Carnelian Agate

Chalcedony (SiO2 with iron oxide impurities)

mineral

Tiger's Eye

SiO2 (Silicon Dioxide with iron inclusions)

Mineral

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

metamorphic

Turquoise

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

mineral

Opalite

Synthetic Opalite Glass (Silicon Dioxide)

mineraloid (man-made)

Red Jasper

Jasper (SiO2 with Fe2O3 inclusions)

sedimentary

Jasper (Green Jasper / Chert)

Silicon Dioxide (SiO2) with iron/clay inclusions

sedimentary

Chert (often called Flint or Jasper based on color)

Microcrystalline Silica (SiO2)

sedimentary

Green Quartz (Prasiolite/Adventurine/Jasper)

Silicon Dioxide (SiO2)

mineral

Fossilized Coral

Cnidaria (Anthozoa), often replaced by Calcium Carbonate (CaCO3) or Silica (SiO2)

sedimentary

Serpentinite

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

metamorphic

Tree Agate

Silicon Dioxide (SiO2) with inclusions of manganese and iron oxides

mineral

Diamond (Round Brilliant Cut)

Diamond (Pure Carbon, C)

mineral

Red Quartzite

Quartzite (SiO2 with iron oxide impurities)

metamorphic

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

sedimentary

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

mineral

Petrified Wood (Silicified Wood)

Silicified Paleoflora (mainly Quartz, SiO2)

metamorphic

Jadeite

NaAlSi2O6 (Sodium Aluminum Silicate)

metamorphic

Ruby

Corundum (Al2O3 with Chromium traces)

mineral