Sedimentary Or Metamorphic

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Gneiss (likely)

Gneiss

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Quartz (specifically Milky Quartz/Quartzite)

Silicon Dioxide (SiO2)

Quartz Crystal

Quartz (SiO₂)

Pyrite

Pyrite (FeS2)

Jasper with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Sorosilicate [Ca2Al2Fe3+Si3O12(OH)]

Quartz

Quartz (SiO2, Silicon Dioxide)

Arsenopyrite with Schist Matrix

Arsenopyrite (FeAsS)

Corundum

Corundum (Aluminium oxide, Al2O3)

Banded Gneiss

Gneiss (variable mineral composition)

Quartz (possibly milky quartz)

Quartz (Silica; SiO₂)

Epidote

Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Quartz

Quartz (SiO₂)

Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone and Quartzite Specimens

SiO2 with varying mineral/clastic inclusions

Blue Aventurine

Silicon Dioxide (SiO2) containing Dumortierite or Crocidolite inclusions

Green Aventurine

Quartz with Fuchsine inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Zebra Jasper

Silicon Dioxide (SiO2) with various inclusions

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Seraphinite (Clinochlore)

Clinochlore (Mg,Fe2+)5Al(Si3Al)O10(OH)8

Rhodonite

Manganese silicate (Mn,Fe,Mg,Ca)SiO3

Biotite or Phlogopite Mica

K(Mg,Fe)3(AlSi3O10)(F,OH)2

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Garnet (likely Almandine or a blend)

Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.

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

Quartz (SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Garnet

Almandine-Pyrope group, X3Y2(SiO4)3

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Veined Quartz

SiO2 (Silicon Dioxide)

Epidote in Quartz

Quartz with Epidote inclusions (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH) inclusions)

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Sapphire

Corundum (Al2O3)