Mineral Like Byproduct

Sandstone (Ferruginous Concretion)

Ferruginous Sandstone Concretion / SiO2 with Fe2O3 cement

Obsidian

Obsidian (volcanic glass; primarily SiO2)

Druzy Chalcedony/Quartz on Fluorite core

Silicon Dioxide (SiO2) on Calcium Fluoride (CaF2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Spinosaurus fossil (permineralized bone)

Spinosaurus aegyptiacus (Calcium phosphate mineralized with silica/sediment)

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)

Limonite (Iron-rich Siltstone / Sandstone base)

Hydrous ferric oxide mixture (FeO(OH)·nH2O)

Bauxite

Bauxite (Al2O3·2H2O)

Lepidolite

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

Rutilated Quartz (likely Citrine or Smoky Quartz with Rutile inclusions)

SiO2 with TiO2 inclusions (Quartz with Rutile)

Man-made Synthetic Material (Costume Faux Fur)

Synthetic Polymer (Polyester/Acrylic)

Obsidian

Volcanic glass

Pegmatite

Granitic Pegmatite

Sandstone or Quartzite

Arenite (if sedimentary) / Quartzite (if metamorphic)

Quartz Pebble

Silicon Dioxide (SiO2)

Pegmatitic Granite

Granite (Alkali-feldspar granite) with Quartz and Orthoclase

Clear Quartz

Silicon Dioxide (SiO2)

Schist

Mica Schist

Gneiss (specifically Banded Gneiss)

Gneiss

Gneiss

Gneiss (High-grade regional metamorphic rock)

Greenstone

Greenschist / Greenstone (Chlorite-Epidote facies)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Pink Dyed Agate (Pink Agate Slice)

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Lepidolite

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

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Garden Quartz (Lodalite)

Silicon Dioxide with various mineral inclusions (SiO2)

Blue Apatite

Fluorapatite / Chlorapatite [Ca5(PO4)3(F,Cl,OH)]

Orthoclase Feldspar

KAlSi3O8 (Potassium aluminum silicate)

Banded Chert

Cryptocrystalline Quartz (SiO2)

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Cuprite

Cuprite (Copper(I) oxide, Cu2O)

Sandstone

Arenite (SiO2 principal)

Rose Quartz

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

Picture Jasper

Tectonically broken chalcedony (SiO2)

Blue Sapphire (likely costume glass imitation)

Corundum (Al2O3) with iron/titanium impurities

Petrified Wood

Silicified Wood (SiO2)

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Banded Gneiss (with possible weathered sulfide or iron staining)

Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides

Blue Apatite

Apatite - Ca5(PO4)3(F,Cl,OH)

Fossilized Shark Teeth

Carcharhiniformes or Lamniformes species (common mineral: Fluorapatite/Ca5(PO4)3F)