igneous
Feldspar Granodiorite
Granodiorite (Na,Ca)(Si,Al)4O8
Hardness: 6-7 (Mohs scale); Color: Pinkish-orange with gray/white matrix; Luster: Pearly to Vitreous; Crystal Structure: Monoclinic/Triclinic; Specific Gravity: 2.6-2.7
- Hardness
- 6-7 (Mohs scale)
- Color
- Pinkish-orange with gray/white matrix
- Luster
- Pearly to Vitreous
Identified More igneous →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 (Mohs scale); Color: Pinkish-orange with gray/white matrix; Luster: Pearly to Vitreous; Crystal Structure: Monoclinic/Triclinic; Specific Gravity: 2.6-2.7
Formation & geological history
Formed from the slow cooling of silica-rich magma beneath the Earth's surface (plutonic). Found in continental crust, often during the Paleozoic or Mesozoic eras during mountain-building events.
Uses & applications
Crushed stone for road construction, building materials, ornamental stone, and occasionally used as a soil conditioner when ground.
Geological facts
Granodiorite is the most common intrusive rock in the Earth's crust; the famous Rosetta Stone was actually carved on a slab of granodiorite.
Field identification & locations
Identify by its interlocking crystalline texture and coarse grain size. Look for the distinct cleavage of feldspar crystals (two planes at near 90 degrees). Commonly found in batholiths and large mountain ranges like the Sierra Nevada.
More like this
Other igneous specimens
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Dark Igneous Rock (Likely Basalt or Diabase)
Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.
Igneous
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Blue Apatite
Apatite (Group), Ca5(PO4)3(F,Cl,OH)
mineral
Magnetite
Magnetite (Fe3O4)
mineral