Mineral Based Human Made Alloy

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

Basalt with Olivine Phenocrysts

Porphyritic Basalt (containing Mg2SiO4 - Fe2SiO4)

Gneiss

Gneiss (pronounced 'nice')

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Snowflake Obsidian

Vitreous Volcanic Glass (Siliceous Obsidian with Cristobalite inclusions)

Sandstone (Ferruginous)

Arenite with Iron Oxides

Veined Quartz

SiO2 (Silicon Dioxide)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Fluorite (likely Green Fluorite variant)

Calcium Fluoride (CaF2)

Granite (likely a river or beach pebble)

Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)

Quartz (vein quartz)

SiO2 (Silicon Dioxide)

Diorite (possibly fine-grained variety or a related intermediate intrusive rock like a felsic gabbro or a dark granodiorite)

Diorite (Igneous rock, intrusive, intermediate composition)

Quartz (Float/Abraded)

Quartz (SiO₂)

Porphyritic Basalt

Amygdaloidal Porphyritic Basalt

Granitoid (Granite/Diorite)

Course-grained Plutonic Igneous Rock

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Rutilated Quartz

Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions

Milky Quartz (Micro-specimen)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Limonitic Sandstone with Inclusion

Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)

Fluorite

Calcium Fluoride (CaF2)

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2 - a variety of actinolite, an amphibole mineral); Jadeite (Na(Al,Fe3+)Si2O6 - a pyroxene mineral)

Granite (Weathered)

Phaneritic Felsic Igneous Rock

Feldspar Rich Granite with Limonite Staining

K-Feldspar Granite (KAlSi3O8)

Sandstone

Arenicola (comprising mostly Quartz, SiO2)

Nephrite Jade

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)

Malachite

Malachite (Cu2CO3(OH)2)

Serpentine Schist with Quartz Vein

Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Sandstone with Quartz Veins

Arenite (primarily SiO2 with Fe2O3 staining)

Granite

Granite (a felsic intrusive igneous rock composed primarily of quartz, feldspar, and mica)

Quartz

Silicon Dioxide (SiO2)

Quartz

Quartz (SiO₂)

Milky Quartz

Silicon Dioxide (SiO2)

Fluorite (likely)

Calcium Fluoride (CaF2)

Queen Conch Shell (Biogenic Calcium Carbonate)

Aliger gigas (synonym Strombus gigas); Composition: Aragonite (CaCO3)

Jade (likely Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Milk Quartz (Common White Quartz)

Quartz (Silicon Dioxide, SiO2)

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.