Mineral Information and Data:

Analcime
Na(Si2Al)O6 • H2O [CNMNC approved formula]

Named in 1797 from the Greek word meaning weak, referring to a weak electrical charge developed on rubbing.

IMA status : Approved Species 1960 ()
CLASSIFICATION 
Dana
(8th edition) :
77.01.01.01  
  (77) Tectosilicate Zeolite group
  (77.01) true zeolites
  (77.01.01) Analcime and related species
  
Nickel-Strunz
(10th edition) :
09.GB.05
  (09) Silicates
  (09.G) Tektosilicates with Zeolitic H2O
  (09.GB) Chains of single connected 4-membered rings
  
Crystal system: Triclinic System
Point group (H-M): 1 — pedial
Unit cell: a = 13.71 Å, b = 13.7044 Å, c = 13.7063 Å, Z = 16; alpha = 90.158°, beta = 89.569°, gamma = 89.543°
Crystal Habit: Crystals usually well-formed trapezohedrons or modified cubes; massive granular
Twinning: On {001} or {110}, polysynthetic
  
Color: Colorless, white, gray, yellowish, pink
Diaphaneity: Transparent to translucent
Luster: Vitreous
Hardness (Mohs): 5 - 5.5
Measured Density: 2.24 - 2.29 g/cm3
Cleavage: 1; {100} very poor
  
Polymorphism and Series: Forms a series with pollucite.
Geologic Setting: In the groundmass or vesicles of silica-poor intermediate and mafic igneous rocks, typically basalts and phonolites, from late-stage hydrothermal solutions, or disseminated due to deuteric alteration. In lake beds, altered from pyroclastics or clays, or as a primary precipitate; authigenic in sandstones and siltstones.
Mineral Association: Zeolites, prehnite, calcite, quartz, glauconite
  
Synonyms/varieties: Analcite, Analcidite
Other Properties: Gemstone Extremely Rare.
Comments: This mineral was first described in 1797 as the mineral analcite. Redefine and approved as analcime (IMA,1960).

 

Analcime
Origin: Mt. St. Hilaire, Quebec, Canada
Sample size: 4 x 3 x 5.5 cm
Photo: Dan Weinrich

 

Analcime
(zoom-in of above)

 

Analcime
Origin: Croft Quarry, Croft Village, Leicestershire, England
Sample size: 6 x 5 x 3 cm
Photo: Tom Loomis

 

Analcime
(zoom-in of above)

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