Pentagonite and Mordenite

ID	435
Mineral	Pentagonite Mordenite
Location	Wagholi Mine - Poona - Maharashtra - India
Fluorescence	LW-UV: close SW-UV: close
Mindat.org	View Pentagonite information at mindat.org View Mordenite information at mindat.org

ID	3152
Long ID	1:1:3152:9
Formula	`CaV⁴⁺OSi₄O₁₀ · 4H₂O`
IMA Status	0
General Appearance	Radiating greenish-blue prismatic crystals.
Occurrence	Cavities and veinlets in basalt and vugs in tuff.
Other Occurrences	Fracture filling in tuffs and basalts.
Discovery Year	1973
Diapheny	Transparent
Cleavage	Good on {010}
Tenacity	brittle
Colour	Greenish blue
Hardness (min)	3.0
Hardness (max)	4.0
About the name	For the pseudosymmetrical five-fold habit of the typical pentagonite twins.
Streak	Light blue
Crystal System	Orthorhombic
Cleavage Type	Distinct/Good
Morphology	Prismatic, bladed.
Twinning	Cyclical by reflection across {110}, producing twinning at an angle near 72.7° ((110) ∧ (_110)), and sometimes giving rise to fivelings.
Publication Year	1973
key_elements	0
shortcode_ima	Ptg

ID	2779
Long ID	1:1:2779:9
Formula	`(Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆ · 28H₂O`
IMA Status	0 1
General Appearance	Rounded masses to about 5 cm, blotched with green celadonite. White, yellowish or pink, sometimes with a thin yellowish crust. With a very fine fibrous structure.
Occurrence	Basalt.
Other Occurrences	Veins and amygdaloids in igneous rocks.
Discovery Year	1864
Diapheny	Transparent,Translucent
Cleavage	Perfect on {100}; distinct on {010}.
Tenacity	brittle
Colour	Colourless, white, yellowish, pinkish
Hardness (min)	3.0
Hardness (max)	4.0
About the name	For the community of Morden, Nova Scotia, the type locality.
Streak	White
Crystal System	Orthorhombic
Cleavage Type	Perfect
Fracture type	Irregular/Uneven
Morphology	Prismatic crystals, acicular to fine fibrous, radiating groups, cottony aggregates, compact, porcelaneous.
Thermal Behaviour	Before the blowpipe it fuses in a good heat without any intumescence to a glassy bead or white enamel.
Comment Luster	Pearly on {010}
Publication Year	1864
shortcode_ima	Mor
Group	Zeolite Group

Price: € 16

Dimensions: Not registered

Weight: 239 g

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