Mineral Information and Data:

Jervisite
NaScSi2O6 [CNMNC approved formula]

Named for William P. Jervis, Curator of the Museo Industriale Italiano di Torino, Torino, Italy.

IMA status : Approved Species 1982 (IMA1980-012)
CLASSIFICATION 
Dana
(8th edition) :
65.01.03c.06  
  (65) Inosilicate Single-Width Unbranched Chains, W=1
  (65.01) with chains P=2
  (65.01.03c) C2/c clinopyroxenes (Na clinopyroxenes)
  
Nickel-Strunz
(10th edition) :
09.DA.25
  (09) Silicates
  (09.D) Inosilicates* Structural terminology per Liebau (1985)
  (09.DA) with 2-periodic single chains, Si2O6; pyroxene family
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Space group: C2/c
Unit cell: a = 9.85Å, b = 9.04Å, c = 5.31Å, β = 106.62°, Z=4
Crystal Habit: As sprays of elongated platy crystals, < 1 mm.
  
Color: Light green
Diaphaneity: Semitransparent
Luster: Vitreous
Cleavage: Perfect on {110}
  
Geologic Setting: In miarolitic cavities in granite.
Mineral Association: Cascandite, quartz, orthoclase, albite
  

 

Jervisite
A wonderful tuft of white jervisite crystals and pink cascandite crystals.
Origin: Seula mine (ex Montecatini quarry), Mount Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy.
Picture size: area of 1mm
Photo and collection: Sergio Varvello

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