Mineral Like (Anthropogenic)

Sandstone

Arenite (Siliclastic sedimentary rock), SiO2 + various minerals

Gneiss (specifically a Granitic Gneiss specimen)

Gneiss (high-grade metamorphic rock primarily composed of Quartz, Feldspar, and Biotite/Amphibole)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive volcanic rock)

Turquoise and Hematite

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)

Petrified Wood

Silicified wood (Quartz, SiO2)

Bull Quartz

Quartz (Silicon Dioxide, SiO2)

Fossilized Shark Tooth

Carcharocles or Otodus sp. (Micro-fossilized)

Fluorite on Matrix

Calcium Fluoride (CaF2)

Rose Quartz

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

Diorite

Diorite (an intrusive igneous rock)

Limonite (Yellow Ochre)

FeO(OH)·nH2O (Hydrous iron(III) oxide-hydroxide mixture)

Lemon (Mock specimen mimicking Citrine/Sulfur)

Citrus x limon

Lepidolite

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

Peacock Ore (Bornite or Iridescent Chalcopyrite)

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with tarnish

Black Tourmaline

Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4

Green Aventurine

Quartz with Fuchsine inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)

Limonite and Hematite Gossan

Hydrated Iron Oxide Mix (FeO(OH)·nH2O) / Ferric oxide (Fe2O3)

Lepidolite

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

Pink Sapphire (Corundum)

Aluminum Oxide (Al2O3) with Chromium/Iron impurities

Red Sandstone

Arenite (Iron-rich)

Amygdaloidal Basalt

Amygdaloidal Basalt containing Zeolite or Quartz (SiO2/Silicates)

Mica Schist

Mica Schist (Quartz-Biotite-Muscovite Schist)

Rose Quartz

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

Strawberry Quartz (Hematoid Quartz)

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Turquoise and Hematite

CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Fe2O3 (Hematite)

Quartz

Silicon Dioxide (SiO2)

Quartz with Iron Oxide

Silicon Dioxide (SiO2) with Fe2O3 inclusions

Quartz Geode

Silicon Dioxide (SiO2)

Gossan (Iron Hat)

Limonitic Gossan (predominantly FeO(OH)·nH2O)

Lepidolite

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

Lepidolite

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

Quartz Pebble (with Hematite Inclusions)

Silicon Dioxide (SiO2)

Sphalerite

Zinc sulfide (Zn, Fe)S

Lepidolite

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

Lepidolite (Lithium Mica)

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

Lepidolite (in Quartz Matrix)

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

Orpiment

Orpiment (As2S3)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Yellow Aventurine

Silicon Dioxide with inclusions (SiO2 + Muscovite/Fuchsite)

Red Sandstone

Arenite (Ferruginous Sandstone)