Igneous And Metamorphic

Milky Quartz

Quartz / Silicon Dioxide (SiO2)

Small pale mineral/rock fragment

Indeterminate; possibly weathered quartz, calcite, or light-colored limestone

Iron-stained quartz with dark mineral inclusions

Quartz (SiO₂), with iron oxides and likely dark mica or other inclusions

Milky quartz with possible feldspar

Quartz (SiO₂), possibly intergrown with feldspar

Ferruginous Quartz

Quartz (Silicon Dioxide) - SiO2 with Iron Oxide inclusions

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz (with trace inclusions)

Silicon Dioxide (SiO2)

Iron-stained quartz vein rock

Quartz (SiO₂) with iron-oxide/hydroxide staining, likely limonite/goethite

Likely dark mineral or rock fragment

Indeterminate from image; possibly a dark silicate mineral such as hornblende, biotite, or basalt

Pink Granite

Phaneritic Granitoid

Weathered limestone or calcareous tufa

Calcite-rich carbonate rock, primarily CaCO₃ (often micritic limestone or travertine/tufa)

Iron-stained quartz with possible feldspar

Quartz (SiO₂), possibly with feldspar and iron-oxide staining

Biotite in Host Matrix

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

Cloudy Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Druzy) on Matrix

Silicon Dioxide (SiO2)

Likely magnetite (iron-oxide mineral)

Magnetite, Fe₃O₄

Quartz vein in iron-stained host rock

Milky quartz (SiO₂) with iron-oxide-stained country rock; exact host rock is unclear from the image

Fossil shell fragment

Indeterminate molluscan bioclast, likely aragonite or calcite

Milky Quartz

Silicon Dioxide (SiO2)

Clear quartz (rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Weathered reddish-brown rock, possibly sandstone

Likely iron-oxide-stained quartz-rich sandstone; exact identification is uncertain from the photo

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

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

Quartz vein in weathered host rock

Likely milky quartz (SiO₂) with iron-oxide staining and altered host rock; exact rock cannot be determined from the photo

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)

Small rough mineral specimen, likely quartz-bearing stone

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

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix