Mineral Like Biological Tissue

Yellow Jasper

Silicon Dioxide (SiO2) with goethite or limonite inclusions

Rose Quartz

Silicon dioxide (SiO2)

Lepidolite and Rubellite (Pink Tourmaline)

Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2] and Rubellite [Na(Li,Al)3Al6(BO3)3Si6O18(OH)4]

Limonite and Goethite on Gossan

FeO(OH)·nH2O

Amethyst

Silicon Dioxide (SiO2)

Sandstone

Arenite (typically SiO2 based)

Greenstone with Epidote or Quartz veins

Metabasalt (Greenstone facies)

Tektite

Tektite (meteoritic glass)

Petrified Wood

Silicified Wood (SiO2)

Schist (containing Muscovite Mica and Chlorite)

Mica Schist

Schist

Metamorphic Rock (Schist)

Yellow Quartzite (River Pebble)

Quartzite (mainly SiO2 with iron oxide impurities)

Dinosaur Skull Fossil (Velociraptor Replica)

Velociraptor mongoliensis fossil specimen in sedimentary matrix

Orthoclase Feldspar

KAlSi3O8 (Potassium aluminum silicate)

Greenstone

Metabasalts and metavolcanics

Granodiorite (Gravel Pebble)

Granodiorite

Kimberlite with Diamonds

Kimberlite (ultramafic potassic igneous rock)

Diorite

Phaneritic intermediate plutonic rock

Quartz Druzy (Geode Fragment)

Silicon Dioxide (SiO2)

Fossilized Shark Tooth (Anterior/Lateral)

Otodus megalodon or Carcharodon carcharias (fossilized)

Dendritic Agate

Silicon Dioxide with Manganese or Iron Oxide inclusions (SiO2)

Gneiss

Gneiss

Ironstone Concretion / Chert Nodules

Iron-rich Sedimentary Concretion (Fe2O3 / SiO2 mix)

Green Fluorite

Calcium Fluoride (CaF2)

Limonite (Iron Ore)

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

Limonite (Iron-rich Gossan/Laterite)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Granite

Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)

Gneiss

Gneiss (High-grade metamorphic rock)

Limonite with Ironstone

Limonite (hydrated iron(III) oxide-hydroxides), FeO(OH)·nH2O

Quartz with Chlorite inclusions

Silicon Dioxide (SiO2) with Chlorite group minerals (hydrous magnesium iron alumino-silicate)

Garden Quartz (Lodolite / Inclusion Quartz)

Quartz with inclusions (SiO2 with various mineral inclusions)

Schist

Metamorphic Rock (Mica Schist)

Greenstone

Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote

Snowflake Obsidian

Volcanic Glass (SiO2 rich with Cristobalite inclusions)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in sedimentary matrix

Granite

Granite (Felsic Plutonic Rock)

Greenstone / Metabasalt

Metamorphosed Mafic Rock (Greenschist facies)

Potassium Feldspar (Orthoclase / Microcline)

KAlSi3O8

Lepidolite on Pegmatite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Gneiss

Gneiss (High-grade metamorphic rock)

Chalcopyrite

Chalcopyrite (CuFeS2)

Quartz-Veined Sandstone

Quartz-veined Arenite