Mineral On Igneous Rock

Greenstone

Metabasalt / Chlorite-Epidote Schist

Granite

Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Granite

Phaneritic Plutonic Felsic Rock (Granite)

Gneiss

Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Gneiss (specifically Micaceous Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Chrome Diopside

Magnesium Calcium Silicate (MgCaSi2O6) containing Chromium impurities

Moss Agate

Silicon Dioxide with inclusions (SiO2 + impurities)

Scoria (Lava Rock)

Mafic extrusive volcanic rock (Scientific formula varies based on mineral content: primarily SiO2, MgO, and FeO)

Granite River Rock

Phaneritic Felsic Igneous Rock (Granite)

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Gneiss Pebble

Gneiss

Carnelian Agate

Silicon Dioxide (SiO2) - Variety: Chalcedony

Basalt

Basalt (Mafic Extrusive)

Quartz

Quartz (SiO₂)

Gneiss (with Quartz and Biotite Mica)

Gneiss

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Porphyry (Flower Stone)

Porphyritic Basalt or Andesite

Amygdaloidal Rhyolite

Rhyolite (felsic volcanic rock) with amygdules

Sodalite

Sodalite (Na4Al3Si3O12Cl)

Banded Gneiss (River Cobble)

Gneiss (a high-grade metamorphic rock)

Dalmatian Stone (Dalmatian Jasper)

Dalmatian Stone (A variety of Perthite / Aplite)

Pink Sapphire

Corundum (Al2O3 with trace Chromium and Iron)

Snowflake Obsidian

Volcanic glass containing Cristobalite (SiO2)

Banded Gneiss

Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)

Rough Quartz in Pegmatite Matrix

Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite

White Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Basalt

Extrusive mafic igneous rock

Basalt with vesicles/amygdules

Basalt (containing volcanic glass and plagioclase)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Labradorite (Larvikite variety)

Feldspar (Plagioclase series), (Na,Ca)(Si,Al)4O8

Basalt (Polished)

Extrusive mafic igneous rock

Basalt (Arrowhead form)

Extrusive mafic igneous rock

Epidosite (Epidote-rich rock)

Epidotalite (primarily Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH))

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Diorite

Diorite (Intermediate Plutonic Rock)

Moonstone (bead form)

Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt

Nuummite

Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)

Obsidian

Obsidian (principally SiO2)