Mineral Like Biological Tissue

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 major component)

White Topaz

Topaz - Al2SiO4(F,OH)2

Fuchsite on Quartz

Muscovite (KAl2(AlSi3O10)(OH)2) with Chromium impurities

Olivine in Basalt matrix

Peridotite (Mg, Fe)2SiO4

Septarian Nodule

Septarian Concretion (Calcium Carbonate/Aragonite/Calcite)

Orange Calcite

Calcium Carbonate (CaCO3)

Schist

Mica Schist

Botryoidal Hematite (Kidney Ore)

Hematite (Fe2O3)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Granite

Phaneritic Plutonic Felsic Rock

Chert (variously known as Flint or Microcrystalline Quartz)

Silicon dioxide (SiO2)

Amazonite

Amazonite (KAlSi3O8, a variety of Microcline)

Rough Green Tourmaline (Verdelite)

Elbaite (Complex Borosilicate), Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)

Corundum (Ruby variety)

Aluminium oxide (Al2O3)

Amber

Succinite (Organic Mineraloid) - C10H16O

Iron Meteorite

Siderite (Iron-Nickel Meteorite)

Serpentinite (often called Jade or Nephrite substitute)

Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)

Carnelian (Chalcedony)

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

Quartz Vein in Host Rock

Quartz (SiO2) in Mafic or Sedimentary Matrix

Chert (containing Calcite or Quartz inclusions)

Silicon Dioxide (SiO2) with varying mineral impurities

Clear Quartz Point

Silicon Dioxide (SiO2)

Sandstone (Water-worn Pebble)

Clastic sedimentary rock (primarily SiO2)

Ferruginous Quartz (Iron-stained Quartzite)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Basalt with Quartz Vein

Basalt (SiO2 vein inclusion)

Sandstone

Arenite (primarily SiO2)

Epidote

Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Soapstone / Steatite

Steatite (primarily Talc, Mg3Si4O10(OH)2)

Granite

Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)

Azurite and Malachite on Matrix

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2

Pyrite in Quartz (Drill Core)

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

Petrified Wood

Silicified Wood (SiO2)

Lapis Lazuli

Complex metamorphic rock containing Lazurite ((Na,Ca)8(AlSiO4)6(SO4,S,Cl)2), Calcite, and Pyrite

Black Opal

Hydrated Silica (SiO2·nH2O)

Peacock Ore (Chalcopyrite)

Chalcopyrite (CuFeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Placer Gold Nugget

Native Gold (Au)

Peacock Ore

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with iridescent tarnish

Grey Quartz (likely Smoky Quartz or Milky Quartz)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)