Mineral Information and Data:

Apophyllite-(NaF)
NaCa4Si8O20F • 8H2O [CNMNC approved formula]

Named from the Greek apophylliso - "it flakes off" and the composition containing Na.

IMA status : Renamed IMA Approved; 2008 (IMA1976-032)
CLASSIFICATION 
Dana
(8th edition) :
72.03.01.03  
  (72) Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.03) with 3-, 4-, or 5-membered rings and 8-membered rings
  (72.03.01) Apophyllite group (4- & 8-membered rings)
  
Nickel-Strunz
(10th edition) :
09.EA.15
  (09) Silicates
  (09.E) Phyllosilicates
  (09.EA) Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Unit cell: a = 8.87Å, b = 8.88Å, c = 15.79Å
Crystal Habit: Crystalline; Massive ; Pseudo Cubic
  
Color: White, Pink, Green, Yellow, Violet.
Diaphaneity: Transparent to Translucent
Luster: Vitreous
Hardness (Mohs): 4 - 5
Measured Density: 2.3 - 2.4 g/cm3
Cleavage: {001} Perfect
  
  
Synonyms/varieties: Natroapophyllite
Comments: IMA approved 1976 as Natroapophyllite. Renamed to Apophyllite-(NaF) in 2008.

 

Apophyllite-(NaF)
Pale pink opaque blocky crystal Apophyllite-(NaF) aggregate.
Origin: Boghil Quarry, Glengormley, Newtownabbey, County Antrim, Northern Ireland.
Photo: Jeff Weissman

<<< BACK TO MINERAL SEARCH