Fraipontite Mineral Data

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.

Name Pronunciation:

Fraipontite + Pronunciation

Synonym:

Zinalsite

Fraipontite Image

Images:

Zaccagnaite Fraipontite

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

Images:

Fraipontite Zinalsite Smithsonite

Comments: Pearly white, sub-mm fraipontite (zinalsite) crystals associated with green smithsonite.
Location: Lavrion District Mines, Lavrion District, Attikí (Attica; Attika) Prefecture, Greece. Scale: Specimen Size 1.4 x 1.0 x 0.9 cm.
© Rob Lavinsky

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 - Domatic H-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

Diaphaneity:

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
Ncalc = 1.69

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:

Bulk Density (Electron Density)=3.44 gm/cc
note: Specific Gravity of Fraipontite =3.53 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Fraipontite= 20.53 barns/electron
U=PE_Fraipontite x rElectron Density= 70.55 barns/cc.

Radioactivity:

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

Fraipontite Classification

Dana Class:

71.01.02c.04 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.01)with 1:1 layers

(71.01.02c)Serpentine group (Amesite subgroup)

71.01.02c.01 Amesite Mg2Al(SiAl)O5(OH)4 C1 1

71.01.02c.02 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m

71.01.02c.03 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2

71.01.02c.04 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m

71.01.02c.05 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 6₃ 6

71.01.02c.06 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1

71.01.02c.07 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3₁m 3m

Strunz Class:

09.ED.15 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.ED -Phyllosilicates with kaolinite layers

09.ED.15 Clinochrysotile? Mg3Si2O5(OH)4 Cc, C 2/m Mono

09.ED.15 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m

09.ED.15 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2

09.ED.15 Amesite Mg2Al(SiAl)O5(OH)4 C1 1

09.ED.15 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m

09.ED.15 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono

09.ED.15 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m

09.ED.15 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3₁m 3m

09.ED.15 Chrysotile Mg3Si2O5(OH)4 A2/m 2/m

09.ED.15 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2

09.ED.15 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono

09.ED.15 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 6₃ 6

09.ED.15 Maufite? (Mg,Ni)Al4Si3O13•4(H2O)(?) Mono ? Mono

09.ED.15 Lizardite Mg3Si2O5(OH)4 P1 1

09.ED.15 Orthochrysotile? Mg3Si2O5(OH)4 Unk Ortho

09.ED.15 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1

09.ED.15 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m

09.ED.15 Parachrysotile? Mg3Si2O5(OH)4 Unk Ortho

Other Fraipontite Information

References:

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

See Also:

Links to other databases for Fraipontite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Fraipontite

(Zn,Al)3(Si,Al)2O5(OH)4
Dana No: 71.01.02c.04 Strunz No: 09.ED.15
Locality:

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