Hodgkinsonite Value, Price, and Jewelry Information


Hodgkinsonite: Franklin, New Jersey. (0.35). Photo © Joel E. Arem, PhD, FGA. Used with permission.

Hodgkinsonite is one of the rarest of all collector gems. Cut stones are bright and richly colored, but the crystals were never abundant and still fewer had transparent areas. Fewer than 10 cut stones may exist.

Hodgkinsonite Value

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

Hodgkinsonite Information

DataValue
NameHodgkinsonite
Crystallography Monoclinic. Crystals pyramidal or prismatic; massive; granular.
Colors Bright pink to reddish brown, purplish pink.
Luster Vitreous
Fracture Conchoidal; brittle.
Hardness 4.5-5
Specific Gravity 3.91-3.99
Birefringence 0.026
Cleavage Perfect 1 direction.
Stone SizesCut gems are very small, less than 2 carats. This is an exceedingly rare material, available from only one locality and only from older specimens. Private Collection: 0.89,
Luminescence Dull red in LW.
Spectral Not diagnostic.
FormulaMnZn2SiO5· H20
Pleochroism Distinct: lavender/ colorless/ lavender.

Opticsa = 1.720; , β= 1.741; γ= 1.746.

Biaxial (- ), 2V= 52°.

Occurrence: in metamorphosed limestone at Franklin, New Jersey with various other Zn and Mn minerals. Individual crystals reached ¾ inch in diameter, in veins up to several inches thick. The material was mined out years ago.

Comments: Hodgkinsonite is one of the rarest of all collector gems. Cut stones are bright and richly colored, but the crystals were never abundant and still fewer had transparent areas. Fewer than 10 cut stones may exist.

Name: After H. H. Hodgkinson of Franklin, New Jersey, who discovered the mineral.