Monazite Value, Price, and Jewelry Information


Monazite
Rob Lavinsky, iRocks.com – CC-BY-SA-3.0 [CC-BY-SA-3.0], via Wikimedia Commons

Monazite may be partially metamict, with N=1.79. Stones can be an attractive yellow or brown color but are usually small.

Monazite Value

The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.

Monazite Information

DataValue
NameMonazite
Crystallography Monoclinic. Crystals small, tabular, wedge-shaped; faces often rough or uneven; also massive, granular; detrital.
Colors Brown, reddish brown, yellowish brown, pink, yellow, greenish, grayish white, white.
Luster Vitreous to subadamantine; resinous; waxy.
Fracture Conchoidal to uneven; brittle.
Hardness 5-5.5.
Specific Gravity 4.6-5.4.
Birefringence 0.049-0.055.
Cleavage Distinct 1 direction, sometimes perfect.
Stone SizesFaceted gems would normally be under 5 carats, either from Swiss crystals or from portions of crystals from other localities. Facetable material is very rare and cut stones are absent from all but a few private collections. Large cabochons could be cut from various large crystals that have been found.
Luminescence None.
Spectral Extremely complex spectra observed, mostly rare earth types.
Formula(Ce,La,Y,Th)PO4.
Pleochroism Faint or none (yellowish shades). Sri Lanka=material=reddish orange/golden yellow.

Optics: a=1.774-1.800; β= 1.777-1.801; γ= 1.828-1849.

Biaxial (+), 2V= 11-15°.

Higher refractive index is accompanied by lower birefringence.

Occurrence: An accessory mineral in igneous rocks and gneisses; sometimes in large crystals in granite pegmatites; as a detrital mineral in sands.

Petaca district, New Mexico; Amelia, Virginia.

Norway; Finland.

Colorado: fine crystals.

Wyoming: crystals to several pounds.

Madagascar: in fine crystals.

Switzerland: excellent crystals in alpine vein deposits.

Sri Lanka: orange pebbles.

Callipampa, Bolivia: good crystals.

Deposits of alluvial material in Australia, India, Brazil, Malaya, Nigeria.

Comments: Monazite may be partially metamict, with N=1.79. Stones can be an attractive yellow or brown color but are usually small.

Name: From the Greek monazein, to be solitary, because of the rarity of the mineral.