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Apophyllite-(KOH) Mineral Data

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General Apophyllite-(KOH) Information

Help on Chemical  Formula: Chemical Formula: KCa4Si8O20(OH,F)•8(H2O)
Help on Composition: Composition: Molecular Weight = 759.07 gm
   Potassium   4.38 %  K     5.27 % K2O
   Sodium      0.45 %  Na    0.61 % Na2O
   Calcium    21.12 %  Ca   29.55 % CaO
   Silicon    29.60 %  Si   63.32 % SiO2
   Hydrogen    0.11 %  H     0.95 % H2O
   Oxygen     43.84 %  O
   Fluorine    0.50 %  F     0.50 % F
                -   %   F    -0.21 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.85Na0.15Ca4Si8O20(OH)0.8F0.2
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Ore Knob mine, Jefferson, Ashe County, North Carolina, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek apophylliso - "it flakes off" and the predominant hydroxyl anion.
Help on Name Pronunciation: Name Pronunciation: Apophyllite-(KOH) + Pronunciation Say APOPHYLLITE-(KOH)
Help on Synonym: Synonym: Hydroxyapophyllite - Renamed to Apophyllite-(KOH) by Mineralogical Record, v39, (2008), p 131

Apophyllite-(KOH) 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-(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

Apophyllite-(KOH) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.76319
Help on Cell Dimensions: Cell Dimensions: a = 8.978, c = 15.83, Z = 2; V = 1,275.97 Den(Calc)= 1.98
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/mnc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.965(1), 2.99(0.67), 1.588(0.26),

Physical Properties of Apophyllite-(KOH)

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
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-(KOH)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.106 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.313 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.274,KPDmeas= 0.2309,KC= 0.2087
Ncalc = 1.41 - 1.5
Help on Optical Data: Optical Data: Uniaxial (+), w=1.542, e=1.543, bire=0.0010.

Calculated Properties of Apophyllite-(KOH)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.35 gm/cc
note: Specific Gravity of Apophyllite-(KOH) =2.35 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEApophyllite-(KOH) = 4.17 barns/electron
U=PEApophyllite-(KOH) x relectron= 9.78 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 63.07 (Gamma Ray American Petroleum Institute Units)
Concentration of Apophyllite-(KOH) per GRapi unit = 1.59 (%)

Estimated Radioactivity from Apophyllite-(KOH) - barely detectable


Apophyllite-(KOH) Classification

Help on  Dana Class: Dana Class: (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) Apophyllite* KCa4(Si4O10)2F•8(H2O) P 4/mnc 4/m 2/m 2/m Apophyllite-(KF) (K,Na)Ca4Si8O20(F,OH)•8(H2O) P 4/mnc 4/m 2/m 2/m Apophyllite-(KOH) KCa4Si8O20(OH,F)•8(H2O) P 4/mnc 4/m 2/m 2/m Apophyllite-(NaF) NaCa4Si8O20F•8(H2O) Pnnm 2/m 2/m 2/m 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-(KOH) Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Apophyllite-(KOH) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.EA.15





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