Mineral On Igneous Rock

Granite fragment

Granite (Felsic Plutonic Rock)

Granite

Felsic intrusive igneous rock

Peridotite

Ultramafic intrusive igneous rock

Small weathered mineral/rock fragment

Unidentified; likely quartz-rich material, possibly quartzite or feldspar-bearing rock

Dalmatian Jasper

Microcrystalline Quartz with Arfvedsonite and Tourmaline inclusions

Pegmatite with Quartz and Feldspar

Intrusive Igneous Rock

Uncertain small stone; possibly weathered quartz-bearing rock

Indeterminate from image; candidate materials include quartz-rich pebble or altered silicate rock

Feldspar-Quartz Rock (likely Pegmatite or Granite)

Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)

Greenstone pebble

Likely chlorite- and/or actinolite-bearing metamorphic rock; exact composition cannot be determined from the image.

Granite

Phaneritic Felsic Igneous Rock

Basalt with Quartz/Calcite Veins

Aphanitic Mafic Igneous Rock (Hydrothermal Veined)

Granite

Felsic intrusive igneous rock

Granite

Phaneritic Felsic Igneous Rock

Likely magnetite-bearing rock

Magnetite (Fe₃O₄), possibly in a mafic host rock

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2) with miscellaneous inclusions

Granite

Granite

Obsidian

Volcanic Glass (Amorphous silicon dioxide with impurities)

Graphic Granite (or Rapakivi-textured Granite)

Alkali feldspar granite

Blue-gray stone pebble (possibly slag or a weathered rock)

Unidentified fine-grained rock; composition cannot be determined from the image

Granite

Felsic intrusive igneous rock

Granite

Felsic intrusive igneous rock

Foliated metamorphic rock, likely mica schist

Mica schist, mainly quartz–feldspar–mica assemblage

Small dark, speckled stone (likely granite or diorite)

Likely fine-grained granitoid; exact identification is uncertain from the small, blurry view

Amygdaloidal Basalt

Extrusive Igneous Rock with Secondary Mineral Fillings

Quartz Vein in Basalt or Mafic Rock

Silicon Dioxide (SiO2) vein in volcanic/mafic matrix

Granite

Felsic intrusive igneous rock

Granite

Granite

Granite Pebble

Granite

Rough amber-colored quartz or calcite fragment

Likely quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Unidentified small mineral fragments

Likely quartz- or feldspar-rich material; species cannot be determined reliably from the image

Granite Pebble

Granitoid (Plagioclase, Alkali feldspar, Quartz, Biotite/Amphibole)

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Small tumbled pebble (likely quartz or feldspar)

Indeterminate; probable quartz (SiO₂) or feldspar

Granite

Felsic intrusive igneous rock

Quartz / Quartzite

Silicon Dioxide (SiO2)

Black Obsidian

Volcanic Glass (Amorphous SiO2 with trace impurities)

Granite

Granite (Felsic Plutonic Rock)

Blue-gray quartz-rich rock, possibly blue aventurine or sodalite-bearing stone

Probable quartz–feldspar aggregate; exact identification requires testing

Iron-rich breccia or weathered ironstone

Goethite–hematite-bearing limonite, possibly with quartz and altered rock fragments

Granite Pebble

Intrusive igneous rock (Quartz, Feldspar, Mica)

Diorite (River Pebble)

Intermediate Phaneritic Igneous Rock

Basalt Pebble

Extrusive Igneous Rock