Mineral (Specifically, A Variety Of The Mineral Species Pyrope Almandine Garnet)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Ruby (Corundum)

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Epidote

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Amethyst

Amethyst (Silicon Dioxide - SiO2 with impurities of iron)

Granite

Granite (felsic intrusive igneous rock)

Mica Schist

Schist (primarily Muscovite and Biotite mica)

Smoky Quartz (with inclusions)

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Limonite Pseudomorph after Pyrite

Limonite (Hydrous iron oxides, FeO(OH)·nH2O) replacing Pyrite (FeS2)

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Conglomerate (Puddingstone)

Conglomerate (specifically, clastic sedimentary rock)

Yooperlite (Sodalite-bearing Syenite)

Sodalite-rich Syenite

Petrified Wood

Silicified wood (primarily Silicon Dioxide - SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Sunstone

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

Rutilated Quartz

SiO2 (Quartz) with TiO2 (Rutile inclusions)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Sunstone

Plagioclase Feldspar (specifically Oligoclase variety containing hematite or goethite inclusions)", composition: (Ca,Na)(Al,Si)2Si2O8

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Schist (Micaceous)

Mica Schist

Amazonite (or Amazon Stone)

Potassium Feldspar (Microcline), K(AlSi3O8)

Chevron Amethyst

Quartz (SiO2) with patterned Amethyst and White Quartz/Milky Quartz

Brachiopod Fossil in Limestone

Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)

Yellow Jasper

Jasper, a microcrystalline variety of Quartz (SiO2) with iron inclusions

Halite

Halite (NaCl)

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).

Ammonite Fossil

Ammonoidea (Calcium carbonate or Pyrite replaced)

Tiger's Eye (specifically Blue Tiger's Eye / Falcon's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Ruby (Corundum)

Al2O3 (Aluminium oxide with Chromium impurities)

Fossilized Brachiopod

Phylum Brachiopoda (replaced by Calcite/CaCO3)

Jasper (specifically Bloodstone or Heliotrope variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Ethiopian Fire Opal

Hydrated Silica (SiO2·nH2O)

Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)

Chalcedony (SiO2), Jasper (SiO2 with impurities)