General Fraipontite Information
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Chemical Formula: |
(Zn,Al)3(Si,Al)2O5(OH)4 |
Composition: |
Molecular Weight = 372.82 gm |
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Aluminum 9.41 % Al 17.78 % Al2O3 |
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Zinc 40.34 % Zn 50.21 % ZnO |
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Silicon 10.55 % Si 22.56 % SiO2 |
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Hydrogen 1.08 % H 9.66 % H2O |
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Oxygen 38.62 % O |
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______ ______ |
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100.00 % 100.21 % = TOTAL OXIDE |
Empirical Formula: |
Zn2.3Al0.7Si1.4Al0.6O5(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. |
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Fraipontite Image |
Images:
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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 |
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Fraipontite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 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), |
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Physical Properties of Fraipontite
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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 |
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Optical Properties of Fraipontite
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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. |
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Calculated Properties of Fraipontite
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Electron Density: |
relectron=3.44 gm/cc note: rFraipontite =3.53 gm/cc. |
Fermion Index |
Fermion Index = 0.02165 Boson Index = 0.97835 |
Photoelectric: |
PEFraipontite = 20.53 barns/electron U=PEFraipontite x relectron= 70.55 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Fraipontite is Not Radioactive |
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Fraipontite Classification
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Dana Class: |
71.1.2c.4 (71)Phyllosilicate Sheets of Six-Membered Rings |
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(71.1)with 1:1 layers |
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(71.1.2c)Serpentine group (Amesite subgroup) |
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71.1.2c.1 Amesite Mg2Al(SiAl)O5(OH)4 C1 1 |
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71.1.2c.2 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m |
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71.1.2c.3 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2 |
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71.1.2c.4 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m |
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71.1.2c.5 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 63 6 |
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71.1.2c.6 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1 |
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71.1.2c.7 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 31m 3m |
Strunz Class: |
VIII/H.27-80 VIII - Silicates |
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VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups |
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VIII/H.27 - Serpentine group |
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VIII/H.27-10 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m |
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VIII/H.27-20 Lizardite Mg3Si2O5(OH)4 P1 1 |
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VIII/H.27-30 Clinochrysotile Mg3Si2O5(OH)4 Cc, C 2/m Mono |
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VIII/H.27-40 Orthochrysotile Mg3Si2O5(OH)4 Unk Ortho |
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VIII/H.27-50 Parachrysotile Mg3Si2O5(OH)4 Unk Ortho |
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VIII/H.27-55 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono |
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VIII/H.27-60 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono |
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VIII/H.27-70 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m |
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VIII/H.27-80 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m |
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VIII/H.27-90 Zinalsite Zn2AlSi2O5(OH)4·2(H2O)(?) Mono |
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VIII/H.27-95 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m |
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VIII/H.27-100 Amesite Mg2Al(SiAl)O5(OH)4 C1 1 |
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VIII/H.27-110 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 63 6 |
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VIII/H.27-120 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 31m 3m |
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VIII/H.27-140 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono |
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VIII/H.27-150 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2 |
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VIII/H.27-160 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m |
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VIII/H.27-170 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2 |
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VIII/H.27-180 Maufite (Mg,Ni)Al4Si3O13·4(H2O)(?) Mono ? Mono |
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VIII/H.27-190 Carlosturanite (Mg,Fe,Ti,Mn)21(Si,Al)12O28(OH)34 Cm m |
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Other Fraipontite Information
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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 - Crocoite.com Mineral Locations
4 - EUROmin Project
5 - Franklin Minerals(Dunn)
6 -Google Images
7 -Google Scholar
8 -Handbook of Mineralogy (MinSocAm)
9 -Handbook of Mineralogy (UofA)
10 -MinDAT
11 -MinMax(Deutsch)
12 -MinMax(English)
13 - Mineral and Gemstone Kingdom
14 -Mineralienatlas (Deutsch)
15 -QUT Mineral Atlas
16 -École des Mines de Paris
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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:
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