Apophyllite Mineral Data + Say APOPHYLLITE

General Apophyllite Information
Help on Chemical Formula: Chemical Formula: KCa4(Si4O10)2F·8(H2O)
Help on Composition: Composition: Molecular Weight = 907.20 gm
   Potassium   4.31 %  K     5.19 % K2O
   Calcium    17.67 %  Ca   24.73 % CaO
   Silicon    24.77 %  Si   52.98 % SiO2
   Hydrogen    1.78 %  H    15.89 % H2O
   Oxygen     49.38 %  O
   Fluorine    2.09 %  F     2.09 % F
                -   %  F    -0.88 % -O=F2
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KCa4(Si4O10)2F·8(H2O)
Help on Environment: Environment: Secondary mineral in basalts. Redefined as a group name for the fluor-, hydroxy- in 1978.
Help on IMA Status: IMA Status: Not Approved IMA 1978
Help on Locality: Locality: Lonault and Poona, southeast of Bombay, India. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in 1800 from the Greek apophylliso - "it flakes off."
Help on Synonym: Synonym: ICSD 12108
  PDF 19-82
 

Apophyllite Image

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Apophyllite   Hydroxyapophyllite   Stilbite

Comments: 3 cm. pink-colored rosette of stilbite and clear "apophyllite" (probably hydroxyapophyllite) in an amygdaloidal cavity.
Location: Aurangabad District, Jalgaon, India. Scale: Specimen size 6 cm.
© Dave Barthelmy
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Apophyllite   Fluorapophyllite   Stilbite

Comments: Doubly terminated, very clear and perfect fluorapophyllite with white stilbite.
Location: Jalgaon, India. Scale: 4 x 3.5 cm.
© Fabre Minerals
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Apophyllite   Hydroxyapophyllite

Comments: Crystal cluster of tabular hydroxyapophyllite.
Location: Wessels Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 2.5 x 2.3 cm.
© John Veevaert
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Apophyllite   Kinoite

Comments: Crystals of dark blue kinoite and clear apophyllite.
Location: Christmas Mine, Gila County, Arizona, USA. Scale: Crystal size 2.5 mm.
© John Veevaert
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Apophyllite

Comments: Mint green to clear apophyllite flat top crystals in a circular stellate cluster on pink stilbite.
Location: Rahuri, Maharashtra State, India. Scale: Specimen size 10 cm.
© Kevin Ward

Apophyllite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:1.76116
Help on Cell Dimensions: Cell Dimensions: a = 8.96, c = 15.78, Z = 2; V = 1,266.84 Den(Calc)= 2.38
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/mnc
 

Physical Properties of Apophyllite

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: White, Pink, Green, Yellow, Violet.
Help on Density: Density: 2.3 - 2.4, Average = 2.34
Help on Diaphaniety: Diaphaniety: Transparent to translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Pseudo Cubic - Crystals show a cubic outline.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Apophyllite

Help on Dichroism (e): Dichroism (e): colorless.
Help on Dichroism (w): Dichroism (w): colorless.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2252,KPDmeas= 0.2281,KC= 0.2273
Help on Optical Data: Optical Data: Uniaxial (+), w=1.535, e=1.537, bire=0.0020.
 

Calculated Properties of Apophyllite

Help on Electron Density: Electron Density:

relectron=2.38 gm/cc
note: rApophyllite =2.35 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.01204
Boson Index = 0.98796
Help on Photoelectric: Photoelectric:

PEApophyllite = 3.56 barns/electron
U=PEApophyllite x relectron= 8.48 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 63.07 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Apophyllite - barely detectable

 

Apophyllite Classification
Help on Dana Class: Dana Class: 72.3.1.0 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.3)with 3-, 4-, or 5-membered rings and 8-membered rings
  (72.3.1)Apophyllite group (4- & 8-membered rings)
 
72.3.1.0 Apophyllite * KCa4(Si4O10)2F·8(H2O) P 4/mnc 4/m 2/m 2/m
 
72.3.1.1 Fluorapophyllite (K,Na)Ca4Si8O20(F,OH)·8(H2O) P 4/mnc 4/m 2/m 2/m
 
72.3.1.2 Hydroxyapophyllite KCa4Si8O20(OH,F)·8(H2O) P 4/mnc 4/m 2/m 2/m
 
72.3.1.3 Natroapophyllite NaCa4Si8O20F·8(H2O) Pnnm 2/m 2/m 2/m
 
72.3.1.4 Carletonite KNa4Ca4Si8O18(CO3)4(OH,F)·(H2O) P 4/mbm 4/m 2/m 2/m
Help on Strunz Class: Strunz Class: VIII/H.01-00 VIII - Silicates
  VIII/H - Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others
  VIII/H.01 - Apophyllite series
 

Other Apophyllite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Mason68) OPTIC PROP.(Mason68)
Help on See Also: See Also: Links to other databases for Apophyllite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Applied Mineralogy 4 -Athena 5 - Crocoite.com Mineral Locations 6 - Franklin Minerals(Palache) 7 -Google Images 8 -Google Scholar 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 - Minerals of Wisconsin 14 -QUT Mineral Atlas 15 - Scandinavian mineral gallery 16 - Tradeshop.com - The Rainbow of Gems 17 - WWW-MINCRYST

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Print or Cut-and-Paste your Apophyllite Specimen Label here :

Apophyllite

KCa4(Si4O10)2F·8(H2O)
Dana No: 72.3.1.0 Strunz No: VIII/H.01-00
Locality:

 

Notes:

 
 
   
 
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