Mineral (Chalcedony Variety)

Rough Rose Quartz

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

Rose Quartz

Silicon Dioxide (SiO2)

Rose Quartz

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

Rose Quartz

Quartz (Silicon Dioxide, SiO2) with trace inclusions of dumortierite

Green Aventurine (likely)

Silicon dioxide (SiO2) with fuchsitemica inclusions

Smoky Quartz

SiO2 (Silicon Dioxide)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Sandstone (lithic wacke)

Arenite / Lithic Wacke (mostly SiO2 with rock fragments)

Ferruginous Sandstone (with possible trace fossils)

Arenite with Iron-Oxide Cement (SiO2 with Fe2O3)

Sandstone (Muddy/Silty Variety)

Arenite with high silt/clay content (clastic sedimentary rock)

Serpentine (variety: Serpentine Rock)

Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Conglomerate

Conglomerate rock

Limonite Concretion (Ironstone)

Limonite (FeO(OH)·nH2O) with Goethite and Hematite

Chert (often called Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz

Quartz (Silicon Dioxide - SiO2)

Jade (likely Nephrite Jade based on appearance)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Demantoid Garnet on Matrix

Demantoid (variety of Andradite Garnet) - Ca3(Fe3+)2(SiO4)3

Basalt with Vesicles

Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)

Chert (variations include Flint/Jasper)

Chert (Silicon Dioxide, SiO2)

Rutilated Quartz

Quartz (SiO2) with Rutile inclusions (TiO2)

Rose Quartz

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

Rose Quartz

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

Rose Quartz

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

Chert Nodule

Microcrystalline Silica (SiO2)

Banded Agate (often called Brown Agate or Chalcedony)

Silicon Dioxide (SiO2)

Turquoise

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

Obsidian

Volcanic Glass (SiO2 - Silicon Dioxide with impurities)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2 + Fe2O3

Schist

Mica Schist (variety: Muscovite/Biotite Schist)

BROWN GRANITE (likely 'Tan Brown' or similar)

Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)

Citrine Quartz

Silicon Dioxide (SiO2) - Ferric Iron impurities

Rose Quartz

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

Iron-stained Milky Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Vesicular Basalt (commonly mistaken for Slag)

Scoriaceous Basalt (composed primarily of Plagioclase Feldspar and Pyroxene)

Obsidian

Volcanic Glass (SiO2 rich)

Rough Green Beryl (Emerald variety)

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Quartz (Smoky/Milky variety with matrix)

Silicon Dioxide (SiO2)

Aragonite (Star Cluster or Twinned variety)

Aragonite (Calcium Carbonate, CaCO3)

Amethyst (Chevron or Dream Amethyst variety)

Tectosilicate Silicon Dioxide (SiO2) with iron impurities

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

Green Aventurine (Propably a tumbled variety)

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Aquamarine and clear quartz

Aquamarine (Be3Al2Si6O18), Quartz (SiO2)