Mineral Information and Data:

Clinoptilolite-Ca
Ca3(Si30Al6)O72 • 20H2O [CNMNC approved formula]

Named as the calcium-dominant phase of the clinoptilolite series. Species name come from the Greek klino - "oblique"; ptylon - "feather" and lithos - "stone". Defined per nomenclature for zeolite minerals (IMA, 1997).

IMA status : Approved Species 1997 ()
CLASSIFICATION 
Dana
(8th edition) :
77.01.04.02b  (This Dana# Added)
  (77) Tectosilicate Zeolite group
  (77.01) true zeolites
  (77.01.04) Heulandite and related species
  
Nickel-Strunz
(10th edition) :
09.GE.05
  (09) Silicates
  (09.G) Tektosilicates with Zeolitic H2O
  (09.GE) Chains of T10O20 Tetrahedra
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Space group: C2/m
Unit cell: a = 17.66Å, b = 17.963(6)Å, c =7.4Å; β = 116.47° Z = 1
Crystal Habit: Crystalline; tabular
  
Color: White, bluish white
Diaphaneity: Transparent to Translucent
Luster: Vitreous
Hardness (Mohs): 3.5 - 4
Measured Density: 2.1 - 2.2 g/cm3
Cleavage: {010}, perfect
Fracture: Uneven
Streak: White
  
Geologic Setting: Most commonly formed as a devitrification product of silicic volcanic glass from tuffs. Also occurs in cavities in rhyolites, andesites, and basalts.
Mineral Association: Zeolites, montmorillonite, hectorite, thenardite, halite, gaylussite, celadonite, quartz, "opal," calcite
  
Comments: The calcium analogue of Clinoptilolite-K and Clinoptilolite-Na.

 

Clinoptilolite-Ca
Glassy bluish crystal aggregates to 6mm of clinoptilolite-Ca in an area 24 x 17 mm vug associated with white, earthy mordenite.
Origin: Cape Lookout quarry,Tillamook, Oregon, United States
Sample size: 6 x 5 x 4 cm
Photo: Tom Loomis

 

Clinoptilolite-Ca
(zoom-in of above)

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