Igneous And Metamorphic

Milky Quartz

Silicon Dioxide (SiO2)

Fossil shell fragment

Indeterminate molluscan bioclast, likely aragonite or calcite

Quartz-rich breccia or quartz vein fragment

Silica, primarily quartz (SiO₂), with possible chlorite, feldspar, or iron-oxide inclusions

Quartz-rich translucent fragment

Quartz, silicon dioxide (SiO₂), possibly chalcedony or vein quartz

Milky quartz with iron-oxide staining

Quartz, silicon dioxide (SiO₂), with hematite/goethite inclusions

Tumbled yellow-brown quartz, possibly citrine or iron-stained quartz

Quartz (SiO₂), likely iron-bearing or included variety

Small metallic mineral fragment

Unidentified metallic sulfide or native-metal fragment

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Vein (Iron-stained)

Silicon Dioxide (SiO2) with limonite/hematite staining

Milky quartz (rough quartz specimen)

Quartz, silicon dioxide (SiO₂)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Clear faceted gemstone, likely cubic zirconia

Synthetic zirconium dioxide (ZrO₂), probably cubic zirconia; exact identification requires testing

Milky Quartz

Silicon Dioxide (SiO2)

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Small rough mineral specimen, likely quartz-bearing stone

Indeterminate from image; possibly quartz (SiO₂) with iron-oxide staining

Quartz-rich rock or quartz specimen

Quartz (SiO₂), likely massive quartz or quartz-bearing host rock

Small reddish-brown mineral fragment

Uncertain; possibly iron-stained quartz, feldspar, or garnet

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Likely weathered sandstone or quartzite

Quartz-rich sandstone; possibly metamorphosed to quartzite (SiO₂-dominant)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Tumbled or naturally weathered quartz-rich stone, possibly iron-stained quartz

Quartz (SiO₂), with yellow-brown iron-oxide staining; exact identification is uncertain from the photograph

Iron-stained quartz-rich rock, likely ferruginous quartzite

Quartzite (predominantly SiO₂) stained by iron oxides, likely hematite and goethite

Pebble

Clast (specifically a granule or small pebble)

Yellow Sapphire (Pukhraj)

Corundum (Al2O3)

Quartz (various varieties)

SiO₂ (Silicon Dioxide)

Milky quartz in weathered host rock

Quartz, silicon dioxide (SiO₂), likely occurring in altered igneous or metamorphic matrix

Magnetite

Magnetite (Fe3O4)

Biotite Mica

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

Magnetite

Magnetite (Fe3O4)

Pyrite Nodules / Weathered Pyrite

Iron Sulfide (FeS2)

Magnetite

Magnetite (Fe3O4)

Aventurine (likely Green Aventurine)

Silicon Dioxide (SiO2) with mineral inclusions

Yellow Sapphire or Citrine

Al2O3 (Corundum) or SiO2 (Quartz)

Quartz pebble

SiO2, Quartz

Pyrite

Iron Sulfide (FeS2)

Quartz (vein quartz)

SiO2 (Silicon Dioxide)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Moonstone

Orthoclase (KAlSi3O8) or Oligoclase with adularescence

Feldspar

Potassium Feldspar (KAlSi3O8)

Hematite

Iron Oxide (Fe2O3)