Mineral Based Human Made Alloy

Porphyritic Basalt

Porphyritic Basalt (with Plagioclase and Augite phenocrysts)

Granite

Granite

Granite Sand (Decomposed Granite)

Grus / Quartz-Feldspar Detritus

Lepidolite

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

Druzy Quartz on Quartz Base

Silicon Dioxide (SiO2)

Man-made Crystal (Lead Glass)

Lead oxide-doped Silica Glass (approx. SiO2 + PbO)

Granite

Phaneritic Felsic Igneous Rock

Likely basalt

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

Crushed Limestone

Calcium Carbonate (CaCO3)

Gneiss (Hornblende/Biotite Gneiss)

Foliated Metamorphic Rock (Quartz-Feldspar-Amphibole/Mica matrix)

Yellow Jasper

Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)

Blue Topaz

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

Lepidolite

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

Lepidolite

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

Jasper / Quartz Pebble

Silicon Dioxide (SiO2) with microcrystalline impurities

Fuchsite Schist

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Schist

Beryl (Aquamarine) in Matrix with Schorl

Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Granitic Pegmatite (Muscovite and Quartz)

Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)

Lepidolite

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

Lepidolite

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

Sandstone (Lithic Arenite)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone nugget

Arenite (primarily Quartz SiO2)

Sandstone (Quartz-rich)

Arenite

Tumbled orbicular granite or granitic gneiss

Granite, chiefly quartz–feldspar–biotite/amphibole; exact variety uncertain from the image

Sandstone (with minor quartz and possible clay components)

Clastic Sedimentary Rock (SiO2 dominated)

White Jade (Nephrite)

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

Dendritic Agate

Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions

Chert (Nodule)

Silicon Dioxide (SiO2)

Granitoid (Granite/Gneiss mix)

Phaneritic Felsic Igneous Rock

Chert (Yellow and Red Jasper)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Emerald in Matrix

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Quartz (Iron-Stained / Ferruginous Quartz)

Silicon Dioxide (SiO2)

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite inclusions (SiO2)

Blue glass-like gemstone specimen (likely dyed or synthetic quartz)

Uncertain; possibly blue-dyed quartz or synthetic glass, not confidently identifiable from the image

Bloodstone

Chalcedony (Variety Heliotrope), SiO2

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Granite

Granite

Chalcedony (Variety: Agate)

Silicon Dioxide (SiO2)

Blue Agate (Dyed)

Silicon Dioxide (SiO2)

Carnelian (Chalcedony)

Silicon Dioxide (SiO2) with trace Iron Oxide