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Apophyllite Mineral Data

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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 Name Pronunciation: Name Pronunciation: Apophyllite + Pronunciation Say APOPHYLLITE
Help on Synonym: Synonym: ICSD 12108
  PDF 19-82
 

Apophyllite Image

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  Apophyllite   Apophyllite-(KOH)   Stilbite-Ca

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-(KF)   Stilbite-Ca   Apophyllite

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-(KOH)   Apophyllite

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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  Kinoite   Apophyllite

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 Dipyramidal H-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 Diaphaneity: Diaphaneity: 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: Non-fluorescent.
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
Ncalc = 1.52 - 1.55
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: Bulk Density (Electron Density)=2.38 gm/cc
note: Specific Gravity of Apophyllite =2.35 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
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)
Concentration of Apophyllite per GRapi unit = 1.59 (%)

Estimated Radioactivity from Apophyllite - barely detectable

 

Apophyllite Classification

Help on  Dana Class: Dana Class: 72.03.01.00 (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)
 
72.03.01.00 Apophyllite* KCa4(Si4O10)2F•8(H2O) P 4/mnc 4/m 2/m 2/m
 
72.03.01.01 Apophyllite-(KF) (K,Na)Ca4Si8O20(F,OH)•8(H2O) P 4/mnc 4/m 2/m 2/m
 
72.03.01.02 Apophyllite-(KOH) KCa4Si8O20(OH,F)•8(H2O) P 4/mnc 4/m 2/m 2/m
 
72.03.01.03 Apophyllite-(NaF) NaCa4Si8O20F•8(H2O) Pnnm 2/m 2/m 2/m
 
72.03.01.04 Carletonite KNa4Ca4Si8O18(CO3)4(OH,F)•(H2O) P 4/mbm 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.EA.15 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EA -Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
 
09.EA.15 Apophyllite* KCa4(Si4O10)2F•8(H2O) P 4/mnc 4/m 2/m 2/m
 
09.EA.15 Apophyllite-(KOH) KCa4Si8O20(OH,F)•8(H2O) P 4/mnc 4/m 2/m 2/m
 
09.EA.15 Apophyllite-(KF) (K,Na)Ca4Si8O20(F,OH)•8(H2O) P 4/mnc 4/m 2/m 2/m
 
09.EA.15 Apophyllite-(NaF) NaCa4Si8O20F•8(H2O) Pnnm 2/m 2/m 2/m
 

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 - Athena
4 - Franklin Minerals(Palache)
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - Scandinavian mineral gallery
14 - Tradeshop.com - The Rainbow of Gems
15 - WWW-MINCRYST

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

Apophyllite

KCa4(Si4O10)2F•8(H2O)
Dana No: 72.03.01.00 Strunz No: 09.EA.15
Locality:

 

Notes:

 

 
   
 


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