Brucite Value, Price, and Jewelry Information


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

Brucite is extremely difficult to cut, and only a few faceted stones in the ½-1 carat size range are known.

Brucite Value

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

Brucite Information

DataValue
NameBrucite
Crystallography Hexagonal; tabular crystals, platy aggregates. Manganoan variety sometimes acicular. Also foliated, massive, fibrous, scaly.
Colors White, pale green, gray, bluish. Manganoan variety yellow to brownish-red, brown
Luster Waxy to vitreous; pearly on cleavages.
Fracture Sectile, plates flexible.
Hardness 2.5
Specific Gravity 2.39
Birefringence 0.010-0.020
Cleavage Perfect basal cleavage.
Stone SizesBrucite is very rarely facetable. The major source for cuttable material is Asbestos, Quebec, which has yielded pale blue gems up to 1+ carats.
Formula (Mn, Ca)3Si3O9
Pleochroism None; colorless in transmitted light.

OPTICS: o= 1.559-1.590; e= 1.580-1.600

Uniaxial (+); sometimes biaxial with small 2V.

OCCURRENCE: In low temperature hydrothermal veins in serpentine, chloritic and dolomite schists, and metamorphic limestones.

Asbestos, Quebec, Canada: Fibrous masses up to several feet in length; also cuttable pale blue masses.

Hoboken, New Jersey: Fibrous aggregates.

Lancaster County, Pennsylvania: Plates nearly 20 cm across.

Brewster, New York: Small crystals.

California; Italy; Scotland; Sweden (Manganoan var.),

USSR.

COMMENTS: Brucite is extremely difficult to cut, and only a few faceted stones in the ½-1 carat size range are known.

NAME:  After Archibald Bruce, an early American mineralogist who first described the species.