Manandonite Mineral Data

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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.

Name Pronunciation:

Manandonite + Pronunciation

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),

Crystal Structure:

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Zheng H , Bailey S W , American Mineralogist , 80 (1995) p.387-393, The crystal structure of manandonite-2H2

Physical Properties of Manandonite

Cleavage:

{001} Perfect

Color:

Colorless, Pearl white.

Density:

2.89

Diaphaneity:

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
Ncalc = 1.64 - 1.67

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:

Bulk Density (Electron Density)=2.77 gm/cc
note: Specific Gravity of Manandonite =2.77 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Manandonite= 1.27 barns/electron
U=PE_Manandonite x rElectron Density= 3.51 barns/cc.

Radioactivity:

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

Manandonite Classification

Dana Class:

71.01.02c.06 (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 Manandonite 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 Manandonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Manandonite

Li2Al4[(Si2AlB)O10](OH)8
Dana No: 71.01.02c.06 Strunz No: 09.ED.15
Locality:

Notes: