Synthetic (Ceramic)

Blue Kyanite

Kyanite (Al2SiO5)

Quartzite

Quartzite (SiO2)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Chert (often called Flint or Jasper depending on color)

Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)

Milky quartz (quartz-rich rock fragment)

Quartz, silicon dioxide (SiO₂)

Lepidolite

K(Li,Al)3(Al,Si)4O10(F,OH)2 (Lithium-bearing phyllosilicate)

Rose quartz cabochon (probable)

Quartz, silicon dioxide (SiO₂); pink color typically caused by trace elements and microscopic inclusions

Amazonite (likely mixed with other feldspars/minerals)

Amazonite is a variety of Microcline, which is a tectosilicate mineral, formula KAISi3O8. The mixed beads could include other feldspars or quartz.

Kyanite

Kyanite (Al2SiO5)

Pegmatite / Granite with Mica

Pegmatite (Igneous Rock composed of Quartz, Feldspar, and Muscovite Mica)

Pink quartz bead strand (likely rose quartz or pink dyed quartz)

Quartz, silicon dioxide (SiO₂); probable rose quartz variety, possibly dyed or treated quartz/chalcedony

Note: Item is not a geological specimen

Homo sapiens (Dermal Appendage: Pilus)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Coal (Bituminous / Anthracite)

Carbonaceous Sedimentary Rock (C)

Iron-stained milky quartz

Quartz (SiO₂), mainly massive or vein quartz, with reddish-brown iron-oxide staining and possible minor feldspar or other vein minerals

Quartz

Quartz (Silicon Dioxide - SiO2)

Pink quartz bead necklace/strand

Quartz, silicon dioxide (SiO₂), likely rose quartz or pink chalcedony; exact identification is uncertain from the image

Quartz

Silicon Dioxide (SiO2)

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Limonite (Iron Ore/Hydrated Iron Oxide)

Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))

Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)

Quartz (SiO₂)

Quartz (milky variety)

SiO2 (Silicon Dioxide)

Quartz (Crystal/Druzy Quartz)

Quartz (SiO₂)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Quartz (likely a form of massive or vein quartz)

Quartz (SiO₂)

Amethyst cluster

Quartz, SiO₂; purple coloration is caused mainly by iron-related defects and natural irradiation

Lepidolite

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

Beryl (Variety Mix)

Be3Al2(Si6O18)

Quartz (likely milky/rose quartz variety)

Quartz (SiO2 - Silicon Dioxide)

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.

Milky Quartz

Quartz (SiO2)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)

Quartz (SiO₂)

Granitic Pegmatite Intrusion in Host Rock

Pegmatite dike in amphibolite or schist

Quartz

Quartz (SiO2, Silicon Dioxide)

Quartz

Quartz (SiO₂)

Shale

Shale

Lepidolite (likely)

K(Li,Al)3(Al,Si)4O10(F,OH)2 (Phyllosilicate mineral, part of the mica group)

Zircon

Zircon (ZrSiO4)

Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)

Quartz (SiO₂ - Silicon Dioxide)

Orthoclase Feldspar (or K-Feldspar)

Orthoclase (KAlSi3O8)