Mineral (Tectosilicate)

Milky Quartz

Silicon dioxide (SiO2)

Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

Limonite (Iron Ore)

Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)

Dendritic Quartz Pebble

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Moss Agate Geode Sphere

Silicon Dioxide (SiO2) - Chalcedony with Chlorite or Manganese inclusions

Black Obsidian

Volcanic Glass (SiO2)

Chalk (Limestone variant)

Calcium Carbonate (CaCO3)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Agate with Druzy Quartz

Silicon Dioxide (SiO2)

Quartz on Matrix

Silicon Dioxide (SiO2)

Cubic Zirconia (in Jewelry)

Zirconium Dioxide (ZrO2)

Blue Diamond

Carbon (C) with trace Boron

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Amber

Amber (C10H16O)

Yellow Quartz (Citrinated Quartz)

Silicon Dioxide (SiO2)

Tiger's Eye (Rough)

Macrocrystalline Quartz (SiO2 with inclusions of Crocidolite)

Greenstone

Metamorphosed Mafic Igneous Rock

Granite Pebble

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Pink Anthracite Coal (dyed)

Anthracite Coal (Artificially Colored)

Granite

Granite (a felsic intrusive igneous rock)

Pegmatite (likely Granitic Pegmatite)

Pegmatite (a coarse-grained igneous rock, often with granitic composition)

Banded Gneiss

Gneiss (pronounced "nice")

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Rhodonite

Rhodonite (Mn2+SiO3)

Emerald

Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.

Quartz (Druzy on Matrix)

Silicon Dioxide (SiO2)

Green Aventurine

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Gneiss

Gneissic Metamorphic Rock (Mineral composition: Quartz, Feldspar, Amphibole/Biotite)

Serpentine, likely a variety of Chrysoprase (green chalcedony) or a similar translucent green mineral.

Serpentine Group Minerals (e.g., Antigorite, Lizardite) or Chalcedony (SiO2) with nickel impurities for Chrysoprase green.

Quartz (Milky/Yellowish Pebble)

Silicon Dioxide (SiO2)

Uraninite (Pitchblende)

Uranium dioxide (UO2)

Aventurine

Quartz (SiO2) with inclusions of Fuchsite

Schist

Mica Schist (primarily Muscovite and Quartz)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Rough Diamond

Diamond (Native Carbon, C)

Dendritic Agate (specifically Orange/Tumbled)

Silicon Dioxide (SiO2) with Oxide Inclusions

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Carved Mottled Greenish-Yellow Crystal/Glass Object

Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.