Prismatine Mineral Data

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.

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

Diaphaniety:

Transparent to Translucent

Hardness:

6.5-7 - Pyrite-Quartz

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Prismatine

Gladstone-Dale:

CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.058 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2043,KPDmeas= 0.2102,KC= 0.217

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:

r_electron=3.30 gm/cc
note: r_Prismatine=3.34 gm/cc.

Fermion Index

Fermion Index = 0.01973
Boson Index = 0.98027

Photoelectric:

PE_Prismatine= 3.16 barns/electron
U=PE_Prismatine x r_electron= 10.43 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Prismatine is Not Radioactive

Prismatine Classification

Dana Class:

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

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

(58.1.1)Dana Group

58.1.1.1 Kornerupine (Mg,Fe)4(Al,Fe)6(SiO4,BO4)5(O,OH)2 C mcm 2/m 2/m 2/m

58.1.1.2 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:

VIII/B.31-12 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with beryllium and boron

VIII/B.31 - Kornerupine - Harkerite series

VIII/B.31-10 Kornerupine (Mg,Fe)4(Al,Fe)6(SiO4,BO4)5(O,OH)2 C mcm 2/m 2/m 2/m

VIII/B.31-12 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

VIII/B.31-15 Magnesiodumortierite (Mg,Ti,[])<1(Al,Mg)2Al4Si3O18-y(OH)yBy=2-3 Pmcn 2/m 2/m 2/m

VIII/B.31-20 Dumortierite Al6.5-7(BO3)(SiO4)3(O,OH)3 Pcmn 2/m 2/m 2/m

VIII/B.31-30 Holtite Al6(Al,Ta)(BO3)[(SiO4,SbO4,AsO4)]3(O,OH)3 P nma 2/m 2/m 2/m

VIII/B.31-40 Grandidierite (Mg,Fe)Al3(BO4)(SiO4)O Pbnm 2/m 2/m 2/m

VIII/B.31-42 Ominelite! (Fe,Mg)Al3BSiO9 Pbnm 2/m 2/m 2/m

VIII/B.31-45 Boralsilite! Al16B6Si2O27 C 2/m 2/m

VIII/B.31-50 Werdingite (Mg,Fe)2Al14B4Si4O37 P1 1

VIII/B.31-60 Harkerite Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10·2(H2O) R 3m 3 2/m

Other Prismatine Information

References:

NAME( Dana) 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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas 10 - Scandinavian mineral gallery

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Prismatine

([ ],Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22
Dana No: 58.1.1.2 Strunz No: VIII/B.31-12
Locality:

Notes: