Prismatine Mineral Data

General Prismatine Information

Chemical Formula:

([ ],Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22

Composition:

Molecular Weight = 755.83 gm

Magnesium 9.97 % Mg 16.53 % MgO

Aluminum 21.78 % Al 41.14 % Al₂O₃

Iron 5.91 % Fe 2.85 % FeO / 5.28 % Fe₂O₃

Silicon 14.12 % Si 30.21 % SiO₂

Boron 0.86 % B 2.76 % B₂O₃

Hydrogen 0.40 % H 3.58 % H₂O

Oxygen 44.45 % O

Fluorine 2.51 % F 2.51 % F

- % F -1.06 % -O=F₂

______ ______

100.00 % 103.81 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_0.3Mg_0.1Mg₃Al_1.5Fe³⁺_0.5Al_4.6Si_3.8B_0.6O₁₈(OH)₃F

Environment:

Metamorphism of boron rich clay sediments to granulite facies.

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

Waldheim, Sachsen (Saxony), Germany Link to MinDat.org Location Data.

Name Origin:

Named for the prismatic form of typical crystals.

Name Pronunciation:

Prismatine + Pronunciation

Prismatine Image

Images:

Prismatine

Comments: Prismatic crystals of prismatine in matrix.
Location: Waldheim, Saxony, Germany. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Prismatine Crystallography

Axial Ratios:

a:b:c =1.1656:1:0.4895

Cell Dimensions:

a = 15.938, b = 13.673, c = 6.693, Z = 4; V = 1,458.54 Den(Calc)= 3.44

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C mcm

Physical Properties of Prismatine

Cleavage:

{110} Perfect

Color:

Yellow brown, Green brown, Brown green.

Density:

3.341 - 3.345, Average = 3.34

Diaphaneity:

Transparent to Translucent

Hardness:

6.5-7 - Pyrite-Quartz

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Prismatine

Gladstone-Dale:

CI meas= 0.054 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.081 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2043,KPDmeas= 0.2102,KC= 0.2223
Ncalc = 1.74 - 1.76

Optical Data:

Biaxial (-), a=1.669-1.671, b=1.681-1.83, g=1.682-1.684, bire=0.0130

Calculated Properties of Prismatine

Electron Density:

Bulk Density (Electron Density)=3.30 gm/cc
note: Specific Gravity of Prismatine =3.34 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Prismatine= 3.16 barns/electron
U=PE_Prismatine x rElectron Density= 10.43 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Prismatine is Not Radioactive

Prismatine Classification

Dana Class:

58.01.01.02 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

(58.01)with cations in [4] and higher coordination; single and double groups (n=1,2)

(58.01.01)Kornerupine Group

58.01.01.01 Kornerupine (Mg,Fe)4Al6(SiO4,BO4)5(O,OH)2 C mcm 2/m 2/m 2/m

58.01.01.02 Prismatine! ([],Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22 C mcm 2/m 2/m 2/m

Strunz Class:

09.BJ.50 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BJ -Sorosilicates with Si3O10, Si4O11, etc

09.BJ.50 Kornerupine (Mg,Fe)4Al6(SiO4,BO4)5(O,OH)2 C mcm 2/m 2/m 2/m

09.BJ.50 Prismatine! ([],Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22 C mcm 2/m 2/m 2/m

Other Prismatine Information

References:

NAME( Min.Mag.,Vol.60,No3,p483-491,1996) PHYS. PROP.(Min.Mag.,Vol.60,No3,p483-491,1996) OPTIC PROP.(Min.Mag.,Vol.60,No3,p483-491,1996)

See Also:

Links to other databases for Prismatine :
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
11 - Scandinavian mineral gallery

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Ask about Prismatine here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Prismatine

([ ],Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22
Dana No: 58.01.01.02 Strunz No: 09.BJ.50
Locality:

Notes: