Metamorphic Or Igneous (Context Dependent)

Granite

Granite (Felsic Plutonic Rock)

Dark weathered pebble, likely basalt

Basalt (fine-grained mafic volcanic rock; commonly plagioclase, pyroxene, and iron oxides)

Weathered sandstone or iron-rich sedimentary fragment

Quartz-rich sandstone, possibly ferruginous sandstone (SiO₂-dominant)

Weathered gray stone, likely granite or gneiss

Probable granitic rock; exact identification is uncertain from the image

Iron-stained quartz vein rock

Quartz-rich vein material with iron oxides/hydroxides (quartz, SiO₂, stained by hematite/goethite); likely hosted in a metamorphic rock

Dearest Ring (Gemstones)

Mixed Gemstones: Diamond (C), Emerald (Be3Al2Si6O18), Amethyst (SiO2), Ruby (Al2O3), Sapphire (Al2O3), Topaz (Al2SiO4(F,OH)2)

Granite Pebble

Phaneritic Felsic Igneous Rock (Granite)

Granodiorite

Granodiorite

Quartz-rich metamorphic rock (probable quartzite)

Quartzite; predominantly crystalline SiO₂, with possible mica and iron-oxide impurities

Unidentifiable Rock Fragment

Milky Quartz

Silicon Dioxide (SiO2)

Corundum (Sapphire in Matrix)

Aluminum Oxide (Al2O3)

Emerald in Matrix

Beryl (Be3Al2Si6O18)

Orange Aventurine (or Tumbled Carnelian)

Quartz (SiO2) with inclusions

Granite cobble

Granite, a coarse-grained felsic intrusive igneous rock, chiefly quartz, potassium feldspar, plagioclase, and dark biotite or hornblende

Mica-rich schist (likely biotite schist)

Biotite–quartz–feldspar schist; mica is chiefly biotite, K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Green Aventurine

Silicon Dioxide (SiO2) with Chromium-rich Fuchsite mica

Granite

Phaneritic Intrusive Igneous Rock (primarily Quartz, Feldspar, and Mica)

Rounded gray stone, likely quartz-rich granitic rock

Probable granite or granitic gneiss; mainly quartz, feldspar, and mica

Ruby (Raw Corundum)

Alumina (Al2O3) with Chromium traces

Reddish-brown, iron-stained rock fragment

Indeterminate; possibly weathered porphyritic volcanic rock

Weathered stone nodule or concretion

Unidentified lithic concretion; composition cannot be determined from the image

Pegmatite

Igneous Pegmatite

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Pink feldspar-bearing pegmatite

Orthoclase–microcline feldspar, chiefly KAlSi₃O₈, in a granitic pegmatite matrix

Tumbled Ruby

Corundum (Al2O3:Cr)

Aventurine

Quartz (SiO2) with Fuchsite inclusions

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Milky Quartz

Silicon Dioxide (SiO2)

Slag Glass / Industrial Slag

Anthropogenic Glass

Black obsidian arrowhead

Obsidian; volcanic glass, typically rhyolitic in composition (mostly SiO₂)

Likely basalt fragment

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine

Unidentified pink-and-green mineral-bearing rock

Not reliably identifiable from the image; possible pink feldspar with green epidote or another green mineral

Ferruginous Quartzite (also known as Ironstone or Gossan)

Ferruginous Quartzite with Goethite/Hematite staining

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Hematite)

Ruby

Corundum (Aluminum Oxide, Al2O3)

Chert (Flint) Artifact

Silicon Dioxide (SiO2)

Chert / Flint Handaxe

Cryptocrystalline Quartz (SiO2)

Quartz with Muscovite Mica

Silicon Dioxide (SiO2) with Potassium aluminum silicate hydroxide fluoride [KAl2(AlSi3O10)(F,OH)2]

Emerald

Beryl (Be3Al2(SiO3)6)

Quartz Vein / Quartz Matrix

Silicon Dioxide (SiO2)

Possible basalt or other dark volcanic rock

Undetermined fine-grained mafic volcanic rock; basalt is a possibility