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Hemimorphite crystals - click for larger pic
Hemimorphite crystals
Photo by Violet Anderson
© Royal Ontario Museum

Hemimorphite crystals - click for larger pic
Hemimorphite crystals
© Doug Merson

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Home > Mineral Descriptions > Hemimorphite - (2 Photos)



Hemimorphite
Zn4(Si2O7)(OH)2 · H2O

     Hemimorphite is an extremely rare accessory mineral at Mont
Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color is usually white to whitish-gray.
Luster is vitreous to silky to dull.
Diaphaneity is translucent to opaque.
Crystal System is orthorhombic; Imm2.
Crystal Habits include compact spheres and botyroidal
   aggregates to 2mm.
Cleavage {110} is perfect and {101} is imperfect.
Fracture is uneven to subconchoidal.
Hardness is 4.5 - 5.
Specific Gravity is approximately 3.45 g/cm3.
Streak is white.
Associated Minerals include galena, natrolite and wulfenite.
Distinguishing Features: Crystal habit and association with
   wulfenite.
Origin: Known since antiquity; named in 1853 from the Greek
   hemi, half, plus morphe, form, because of the lack of a center
   of symmetry.

CLASSIFICATION:

Dana System
# 56.1.2.1

Strunz Classification
# VIII/C.08-10

REFERENCES:
MinRec 21:314 (1990), Dana 8:1150-1152 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
¤¤

MX
--

SS
--

MC
--

HF
--

BR
--

SX
--

FR
--

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