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Diameter, mm (1mm - 0,039inch)
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  2. Collectible minerals
  3. Prehnite

Collectible minerals - full range in stock "Prehnite"

Prehnite is the first of the minerals named after a real person - Captain Hendrik von Pren, who first brought it from the Cape of Good Hope to Europe. Prehnite is characterized by dense masses and reniform aggregates. Short columnar crystals are rare. High-quality translucent prehnite is classified as a gemstone of the third order and is used in jewelry. In processed form, it can be confused with chrysolite.

You can see prehnite stone for sale and buy it in the Minerals of Russia online store.

Physical properties of Prehnite

General
Category Silicate mineral
Formula
(repeating unit)		 Ca2Al(AlSi3O10)(OH)2
IMA symbol Prh
Strunz classification 9.DP.20
(Inosilicate transitional to phyllosilicate)
Dana classification 72.1.3.1
(Phyllosilicate)
Crystal system Orthorhombic
Crystal class Pyramidal (mm2)
(same H-M symbol)
Space group P2cm
Identification
Color Colorless to gray to yellow, yellow-green or white
Crystal habit Globular, reniform to stalactitic
Twinning Fine lamellar
Cleavage Distinct on [001]
Tenacity Brittle
Mohs scale hardness 6 - 6.5
Luster Vitreous - pearly
Streak White
Diaphaneity Semi-transparent to translucent
Specific gravity 2.8 - 2.95
Optical properties Biaxial (+)
Refractive index nα = 1.611 - 1.632
nβ = 1.615 - 1.642
nγ = 1.632 - 1.665
Birefringence δ = 0.021 - 0.033
Dispersion weak r > v
Ultraviolet fluorescence Fluorescent, short UV=blue white mild peach, long UV=yellow
Prehnite, Apophyllite, Laumontite
Code: 2620
Prehnite, Apophyllite, Laumontite
Trudolyubovka, Crimea
48*42*29mm

0.00 $ $110.00

Prehnite archived
Code: 2802
Prehnite
Putorana Plateau, Krasnoyarsk Territory, RF.
48*35*12mm

0.00 $ $12.00

Prehnite archived
Code: 2766
Prehnite
Putorana Plateau, Krasnoyarsk Territory, RF.
60*35*30mm

0.00 $ $20.00

Prehnite archived
Code: 328
Prehnite
Putorana Plateau, Krasnoyarsk Territory, RF
66*60*51mm

0.00 $ $26.67

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