Metamorphic Rock (Specifically A Rock Composed Of Minerals)

Granite

Phaneritic plutonic rock (SiO2-rich)

Sandstone

Arenite (primarily SiO2)

Quartzite (River Stone)

Quartzite (SiO2)

Bumblebee Jasper

Carbonate-rich volcanic rock containing Sulfur and Arsenic (Realgar/Orpiment)

Pink Granite / Gneiss

Felsic Plutonic Rock (Granite) with Gneissic banding

Likely quartzite pebble

Quartzite, composed predominantly of quartz (SiO₂)

Bauxite

Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))

Granite

Intrusive Igneous Rock

Pink-and-black gneiss

Foliated granitic gneiss, commonly quartz–feldspar–biotite gneiss

Rounded sandstone pebble

Quartz-rich sandstone; commonly arkose or lithic sandstone

Vesicular basalt (possibly weathered amygdaloidal basalt)

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine, with weathering minerals filling vesicles

Weathered quartz-rich pebble

Likely milky quartz (SiO₂), possibly a quartz-rich vein fragment

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, e.g., Antigorite, Lizardite, or Chrysotile)

Quartz-rich granite pebble

Granite, composed mainly of quartz, feldspar, and mica

Red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Granite (likely weathered, coarse-grained granite)

Granite, composed chiefly of quartz, feldspar, and mica

Botryoidal Chalcedony (Agate)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Quartz Druzy

Silicon Dioxide (SiO2)

Gneiss

Foliated Metamorphic Rock (Gneiss)

Quartzite

Quartzite (composed primarily of SiO2)

Slate

Slate; fine-grained metamorphic rock composed mainly of clay minerals, mica, and quartz

Sandstone (Quartz-rich)

Arenite (composed primarily of SiO2)

Quartzite (specifically Milky Quartz variety)

Quartz (SiO2)

Diorite

Diorite (intermediate intrusive igneous rock)

Yellow Quartzite Pebble

Quartzite (SiO2)

Milky Quartz (Common Quartz)

Quartz (Silicon Dioxide, SiO2)

Likely river-worn granite or granitic pebble

Granite (quartz + feldspar + mica), identification from the image is tentative

Vesicular Basalt

Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)

Granite (Pebble)

Intrusive Felsic Igneous Rock

Greenstone (likely metamorphosed basalt)

Metabasalt/greenstone; commonly composed of chlorite, actinolite, epidote, albite, and quartz

Quartz-rich pegmatite (likely feldspar and quartz)

Granitic pegmatite composed mainly of quartz (SiO₂) and feldspars

Quartzite

Quartzite (composed primarily of SiO2)

Quartzite

Quartzite (composed primarily of SiO2)

Shiva Lingam

Cryptocrystalline Quartz and Iron Oxide

Pink Granite

Phaneritic intrusive igneous rock (Felsic)

Banded Gneiss

Gneiss (high-grade metamorphic silicate rock)

Serpentinite

Serpentinite (composed largely of Serpentine minerals such as Lizardite, Antigorite, and Chrysotile: Mg3Si2O5(OH)4)

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica)

Granite fragment

Granite (Felsic intrusive igneous rock)

Pink Granite

Phaneritic plutonic igneous rock (Alkali feldspar granite)