Mineral Based Composite

Obsidian

Volcanic glass (Amorphous silicon dioxide)

Dalmatian Jasper

Peralkaline Quartz-feldspathic Rock (Arfvedsonite-bearing)

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).

Calcite

Calcite (CaCO3)

Specularite (Specular Hematite)

Iron Oxide (Fe2O3)

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Basalt with Plagioclase Feldspar

Basalt (mafic extrusive igneous rock) with plagioclase feldspar phenocrysts

Sandstone

Quartz Sandstone (predominantly)

Tumbled dark banded stone, possibly indigo gabbro or banded basalt

Indeterminate; likely fine-grained mafic rock composed mainly of plagioclase and pyroxene, with possible amphibole or alteration minerals

Dark green metamorphic rock, likely serpentinite

Serpentinite, composed mainly of serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and minor chlorite/talc

Basalt with Magnetite

Crystalline Basalt (Primarily Plagioclase and Pyroxene) with Magnetite (Fe3O4)

Sandstone

Quartz Arenite (a type of sandstone composed of more than 90% quartz)

Dalmatian Stone

Dalmatian Jasper (Aplitic Perthite)

Dark coarse-grained rock, likely basalt or gabbro

Basalt (fine-grained) or gabbro (coarse-grained), composed mainly of plagioclase feldspar and pyroxene

Bauxite Ore

Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)

Chrysoprase

Chrysoprase (a variety of Chalcedony, SiO₂)

Moonstone

Adularia or Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8), specifically with lamellar exsolution of albite and orthoclase.

Serpentinite

Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, and Chrysotile, (Mg,Fe)3Si2O5(OH)4)

Small dark volcanic rock, likely basalt

Basalt; chiefly plagioclase feldspar, clinopyroxene, and minor olivine or iron-titanium oxides

Que Sera Stone (Llanite / Blue Quartz with Feldspar and Iron Oxides)

Porphyritic Rhyolite (Quartz-Feldspar Porphyry)

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)

Granite

Granite (a common rock type, not a single mineral; composed primarily of Quartz, Feldspar (Orthoclase and Plagioclase), and Mica (Biotite and/or Muscovite) and/or Amphibole)

Sandstone

Sandstone (lithified sand)

Rutilated Quartz

SiO2 with TiO2 inclusions (Rutile)

Banded Gneiss

Gneiss (variable mineral composition)

Limonitic Gossan

Goethite/Limonite aggregate after sulfide

Dark gray fine-grained rock, likely basalt

Basalt; chiefly plagioclase feldspar and pyroxene, often with minor olivine and magnetite

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

Serpentinite

Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)

Botryoidal Chalcedony with Calcite

Chalcedony (SiO2 with accessory minerals, likely CaCO3)

Tiger's Eye

Silicon dioxide (SiO2) with fibrous inclusions of crocidolite (riebeckite) that have been altered to limonite and then replaced by quartz

Calcite

Calcite (CaCO3)

Banded Jasper (possibly "Picture Jasper")

Jasper (a microcrystalline variety of Quartz / Silicon Dioxide - SiO2)

Sandstone

Sandstone (lithified arenite/wacke)

Sandstone

Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)

Sandstone (likely a river or beach pebble)

Sandstone (a clastic sedimentary rock)

Weathered quartz-rich rock fragment

Indeterminate; possibly weathered granite, quartzite, or rhyolite

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)

Serpentinite

Serpentinite (composed primarily of mineral group (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)