Fraipontite Mineral Data

Fraipontite Mineral Data +

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General Fraipontite Information

Chemical Formula:

(Zn,Al)3(Si,Al)2O5(OH)4

Composition:

Molecular Weight = 372.82 gm

Aluminum 9.41 % Al 17.78 % Al₂O₃

Zinc 40.34 % Zn 50.21 % ZnO

Silicon 10.55 % Si 22.56 % SiO₂

Hydrogen 1.08 % H 9.66 % H₂O

Oxygen 38.62 % O

______ ______

100.00 % 100.21 % = TOTAL OXIDE

Empirical Formula:

Zn_2.3Al_0.7Si_1.4Al_0.6O₅(OH)₄

Environment:

Alteration product of smithsonite.

IMA Status:

Valid Species (Pre-IMA) 1927

Locality:

Vielle-Montagne, Belgium. Link to MinDat.org Location Data.

Name Origin:

Named for Julien Jean Joseph Fraipont (1857-1910), and Charles Fraipont, of Liege, Belgium, both geologists and paleontologists.

Fraipontite Image

Images:

Fraipontite Zaccagnaite

Comments: Scanning electron microscope image of hexagonal, tapering, prismatic zaccagnaite crystals, covered by a thin crust of fraipontite. (AmMin 86:1294).
Location: Marble quarries of the Carrara basin (Apuan Alps, Italy). Scale: See Image.
© American Mineralogist

Fraipontite Crystallography

Axial Ratios:

a:b:c =0.581:1:0.7866

Cell Dimensions:

a = 5.372, b = 9.246, c = 7.273, Z = 2; beta = 103.55° V = 351.19 Den(Calc)= 3.53

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Cm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 7.03(1), 3.52(0.7), 2.65(0.4),1.54(0.3), 2.385(0.3), 2.49(0.3), 4.6(0.2),

Physical Properties of Fraipontite

Cleavage:

[???] Perfect

Color:

Bluish, Yellowish white, Light green.

Density:

3.54

Diaphaniety:

Subtransparent to opaque

Fracture:

Unknown - Minerals too small to observe fractures.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Porcelainous - Fine-grained, translucent massive material like broken china

Hardness:

2.5 - Finger Nail

Luster:

Silky

Streak:

white

Optical Properties of Fraipontite

Gladstone-Dale:

CI meas= 0.102 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.1 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1764,KPDmeas= 0.1759,KC= 0.1959

Optical Data:

Biaxial (-), a=1.62, b=1.624, g=1.624, bire=0.0040, 2V(Calc)=0, 2V(Meas)=15-20.

Calculated Properties of Fraipontite

Electron Density:

r_electron=3.44 gm/cc
note: r_Fraipontite=3.53 gm/cc.

Fermion Index

Fermion Index = 0.02165
Boson Index = 0.97835

Photoelectric:

PE_Fraipontite= 20.53 barns/electron
U=PE_Fraipontite x r_electron= 70.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fraipontite is Not Radioactive

Fraipontite Classification

Dana Class:

71.1.2c.4 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.1)with 1:1 layers

(71.1.2c)Serpentine group (Amesite subgroup)

71.1.2c.1 Amesite Mg2Al(SiAl)O5(OH)4 C1 1

71.1.2c.2 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m

71.1.2c.3 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2

71.1.2c.4 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m

71.1.2c.5 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 6₃ 6

71.1.2c.6 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1

71.1.2c.7 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3₁m 3m

Strunz Class:

VIII/H.27-80 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.27 - Serpentine group

VIII/H.27-10 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m

VIII/H.27-20 Lizardite Mg3Si2O5(OH)4 P1 1

VIII/H.27-30 Clinochrysotile Mg3Si2O5(OH)4 Cc, C 2/m Mono

VIII/H.27-40 Orthochrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-50 Parachrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-55 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono

VIII/H.27-60 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono

VIII/H.27-70 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-80 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-90 Zinalsite Zn2AlSi2O5(OH)4·2(H2O)(?) Mono

VIII/H.27-95 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m

VIII/H.27-100 Amesite Mg2Al(SiAl)O5(OH)4 C1 1

VIII/H.27-110 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 6₃ 6

VIII/H.27-120 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3₁m 3m

VIII/H.27-140 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono

VIII/H.27-150 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2

VIII/H.27-160 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m

VIII/H.27-170 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2

VIII/H.27-180 Maufite (Mg,Ni)Al4Si3O13·4(H2O)(?) Mono ? Mono

VIII/H.27-190 Carlosturanite (Mg,Fe,Ti,Mn)21(Si,Al)12O28(OH)34 Cm m

Other Fraipontite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Fraipontite

(Zn,Al)3(Si,Al)2O5(OH)4
Dana No: 71.1.2c.4 Strunz No: VIII/H.27-80
Locality:

Notes: