Friedelite is a mineral that is unusual mostly found as opaque material prized for the colorful luminescense under UV light. Facetable crystals are extremely small and therefore, gems are tiny and very rare. Gems are really a gorgeous, sleepy red. Franklin, nj-new jersey is the origin that is primary of material.


Crystallography: Monoclinic – Prismatic
Crystal Habit: Monoclinic, pseudohexagonal. As pseudohexagonal tablets, may be hemimorphic, to 1 cm; more rarely as slender needles or as fibrous or lamellar aggregates; stalactitic, massive, cryptocrystalline. Twinning: Universal, pseudorhombohedral symmetry.


Cleavage: Perfect on [010]
Fracture: Uneven
Tenacity: Brittle
Moh’s Hardness: 5.0 – 5.5
Density: 3.04 – 3.07 (g/cm3)
Radioactivity: Not Radioactive


Color: Pale pink, pinkish red, brownish red, dark red, brown
Transparency: Translucent to Transparent
Luster: Vitreous, pearly
Refractive Index: 1.630 – 1.660  Biaxial
Birefringence: 0.030
Dispersion: n/a
Pleochroism: n/a