ZEOLITES

Zeolites are microporous, aluminosilicate minerals which commonly occur in cavities in basalt.

Approximately 40 species of zeolites are known to occur naturally. The most common of these are analcime, chabazite, clinoptilolite, natrolite, phillipsite and stilbite. Other zeolite minerals include apophyllite, epistilbite, gmelinite, gyrolite, heulandite, mordenite, mesolite, okenite, phacolite, scolecite, stellarite and thompsonite.

The term zeolite was originally coined in 1756 by Swedish mineralogist Axel Fredrik Cronstedt, who observed that rapidly heating a material, believed to have been stilbite, produced large amounts of steam from water that had been adsorbed by the material. Based on this, he called the material zeolite, from the Greek ζέω (zéō), meaning "to boil" and λίθος (líthos), meaning “stone".

Approximately 40 species of zeolites are know to occur naturally. The most common of these are analcime, chabazite, clinoptilolite, natrolite, phillipsite and stilbite

Other zeolite minerals include apophyllite, epistilbite, gmelinite, gyrolite, heulandite, mordenite, mesolite, okenite, phacolite, scolecite, stellarite and thompsonite.


Go to: APOPHYLLITE

APOPHYLLITE

KCa4Si8O20(F,OH).8H2O

Crystal: Tetragonal
Hardness: 4.5 - 5
Sp.G.: 2.3 - 2.4
Cleavage: Perfect
Fracture: Uneven
Colour: White to Greenish
Lustre: Pearly; Vitreous.

APOPHYLLITE
Jalgaon,
Maharashtra,
INDIA

Go to: HEULANDITE

HEULANDITE

(CaNa)2-3Al3(Al,Si)2Si13O36.12H2O

Crystal: Monoclinic.
Cleavage: Perfect Basal
Hardness: 3.5 - 4
Sp.G.: 2.2
Fracture: Uneven to Subconchoidal
Colour: Colourless, Yellow, Green,
White, Pale Pink
Lustre: Pearly, Vitreous

HEULANDITE on MORDENITE
Panpoi Phata, Kannad District,
Aurangabad, Maharashtra,
INDIA

Go to: STELLERITE

STELLERITE

Ca(Al2Si7O18).7H2O
Crystal: Orthorhombic
Hardness: 4.5
Sp.G.: 2.13
Cleavage: Perfect
Fracture: Uneven
Colour: Colourless to White, Pink, Orange
Lustre: Pearly

STELLERITE
Aurangabad, Poona District,
Maharastra,
INDIA

Go to: MESOLITE

MESOLITE

Na2Ca2(Al2Si3O10)3·8H2O

Crystal: Orthorhombic
Hardness: 5
Sp.G.: 2.7 - 3.0
Cleavage: Perfect
Fracture: Uneven
Colour: Colourless, White, Grey,
Lustre: Vitreous, Silky

POLLUCITE

(Cs,Na)2Al2Si4O12·2H2O

Crystal: Isometric
Hardness: 6.5 - 7
Sp.G.: 2.26
Cleavage: None Observed
Fracture: Conchoidal to Uneven
Colour: Colourless, White, Grey,
Pink, Blue or Violet
Lustre: Vitreous to Greasy

Go to: SCOLECITE

SCOLECITE

CaAl2Si3O10•3H2O

Crystal: Monoclinic
Cleavage: Perfect on {110}
Hardness: 5 - 5.5
Sp.G.: 2.16 - 2.40
Fracture: Uneven to Subconchoidal
Colour: Colourless, White,
Pink, Salmon, Red, Green
Lustre: Vitreous, Silky when fibrous

SCOLECITE
Panpoi Phata, Kannad District,
Aurangabad, Maharashtra,
INDIA

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