Manandonite Mineral Data

Manandonite Mineral Data +

General Manandonite Information

Chemical Formula:

Li2Al4[(Si2AlB)O10](OH)8

Composition:

Molecular Weight = 511.82 gm

Lithium 2.71 % Li 5.84 % Li₂O

Aluminum 26.36 % Al 49.80 % Al₂O₃

Silicon 10.97 % Si 23.48 % SiO₂

Boron 2.11 % B 6.80 % B₂O₃

Hydrogen 1.58 % H 14.08 % H₂O

Oxygen 56.27 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Li₂Al₅Si₂BO₁₀(OH)₈

Environment:

Pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1912

Locality:

Antandrokomby, near Mt. Bity on the Manandona River, Madagascar. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Manandonite Image

Images:

Manandonite

Comments: Massive manandonite with crystals to 2 mm.
Location: Manandona River, Sahatany Valley, Madagascar. Scale: 2.2 x 1.3 cm.
© John Veevaert

Manandonite Crystallography

Axial Ratios:

a:b:c =0.5777:1:1.5699

Cell Dimensions:

a = 5.07, b = 8.776, c = 13.778, Z = 2; alpha = 90.09°, beta = 90.12°, gamma = 89.97° V = 613.04 Den(Calc)= 2.77

Crystal System:

Triclinic - PedialH-M Symbol (1) Space Group: C1

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

By Intensity(I/I_o): 6.92(1), 3.447(0.8), 2.376(0.35),

Physical Properties of Manandonite

Cleavage:

[001] Perfect

Color:

Colorless, Pearl white.

Density:

2.89

Diaphaniety:

Transparent to translucent

Fracture:

Micaceous - Fracture of flexable micaceous cleavage fragments.

Habit:

Massive - Lamellar - Distinctly foliated fine-grained forms.

Habit:

Micaceous - Platy texture with "flexible" plates.

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

2.5-3.5 - Finger Nail-Copper Penny

Luster:

Pearly

Streak:

white

Optical Properties of Manandonite

Gladstone-Dale:

CI meas= 0.101 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.063 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2178,KPDmeas= 0.2088,KC= 0.2323

Optical Data:

Biaxial (+), a=1.6, b=1.6, g=1.61, bire=0.0100, 2V(Calc)=0, 2V(Meas)=14-30.

Calculated Properties of Manandonite

Electron Density:

r_electron=2.77 gm/cc
note: r_Manandonite=2.77 gm/cc.

Fermion Index

Fermion Index = 0.01163
Boson Index = 0.98837

Photoelectric:

PE_Manandonite= 1.27 barns/electron
U=PE_Manandonite x r_electron= 3.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Manandonite is Not Radioactive

Manandonite Classification

Dana Class:

71.1.2c.6 (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.23-100 VIII - Silicates

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

VIII/H.23 - Chlorite group

VIII/H.23-10 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m

VIII/H.23-20 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

VIII/H.23-30 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m

VIII/H.23-40 Orthochamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho

VIII/H.23-50 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri

VIII/H.23-60 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m

VIII/H.23-70 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

VIII/H.23-80 Gonyerite Mn3[Mn3Fe][(Si,Fe)4O10](OH,O)8 pseudo-HEX Ortho

VIII/H.23-90 Cookeite LiAl4(Si3Al)O10(OH)8 P 2₁/a 2/m

VIII/H.23-95 Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m

VIII/H.23-100 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1

VIII/H.23-110 Franklinfurnaceite Ca2(Fe,Al)MnMn3Zn2Si2O10(OH)8 C 2 2

Other Manandonite Information

References:

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

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

Manandonite

Li2Al4[(Si2AlB)O10](OH)8
Dana No: 71.1.2c.6 Strunz No: VIII/H.23-100
Locality:

Notes: