Surinamite Mineral Data

Surinamite Mineral Data +

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General Surinamite Information

Chemical Formula:

(Mg,Fe++)3Al4BeSi3O16

Composition:

Molecular Weight = 553.76 gm

Magnesium 9.88 % Mg 16.38 % MgO

Beryllium 1.63 % Be 4.52 % BeO

Aluminum 19.49 % Al 36.83 % Al₂O₃

Iron 7.56 % Fe 9.73 % FeO

Silicon 15.22 % Si 32.55 % SiO₂

Oxygen 46.23 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg_2.25Fe²⁺_0.75Al₄BeSi₃O₁₆

IMA Status:

Approved IMA 1976

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 31212

PDF 38-433

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Surinamite Crystallography

Axial Ratios:

a:b:c =0.8705:1:0.846

Cell Dimensions:

a = 9.91, b = 11.384, c = 9.631, Z = 4; beta = 109.3° V = 1,025.46 Den(Calc)= 3.59

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 1.99(1), 2.435(1), 1.42(0.6),

Crystal Structure:

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Moore P B , Araki T , American Mineralogist , 68 (1983) p.804-810, Surinamite, ca. Mg3Al4Si3BeO16: its crystal structure and relation to, sapphirine, ca. Mg2.8Al7.2Si1.2O16

View Additional jPOWD Structure files for Surinamite
[1] [2]

Physical Properties of Surinamite

Cleavage:

[010] Good

Color:

Blue, Blue green.

Density:

3.58

Streak:

white

Optical Properties of Surinamite

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2068,KPDmeas= 0.2074,KC= 0.2058

Optical Data:

Biaxial (-), a=1.738, b=1.743, g=1.746, bire=0.0080, 2V(Calc)=74, 2V(Meas)=67-68.

Calculated Properties of Surinamite

Electron Density:

r_electron=3.53 gm/cc
note: r_Surinamite=3.59 gm/cc.

Fermion Index

Fermion Index = 0.03508
Boson Index = 0.96492

Photoelectric:

PE_Surinamite= 3.62 barns/electron
U=PE_Surinamite x r_electron= 12.81 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Surinamite is Not Radioactive

Surinamite Classification

Dana Class:

69.2.1b.2 (69)Inosilicate Chains with Side Branches or Loops

(69.2)with P>2

(69.2.1b)Aenigmatite and related species (Sapphirine subgroup)

69.2.1b.1 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1

69.2.1b.2 Surinamite (Mg,Fe)3Al4BeSi3O16 P 2₁/n 2/m

69.2.1b.3 Khmaralite! (Mg,Al,Fe)16(Al,Si,Be)12O40 P 2₁/c 2/m

Strunz Class:

VIII/F.15-20 VIII - Silicates

VIII/F - Inosilicates (chain and band) modified double chains

VIII/F.15 - Sapphirine - Surinamite series

VIII/F.15-10 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1

VIII/F.15-15 Khmaralite! (Mg,Al,Fe)16(Al,Si,Be)12O40 P 2₁/c 2/m

VIII/F.15-20 Surinamite (Mg,Fe)3Al4BeSi3O16 P 2₁/n 2/m

Other Surinamite Information

References:

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

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Surinamite

(Mg,Fe++)3Al4BeSi3O16
Dana No: 69.2.1b.2 Strunz No: VIII/F.15-20
Locality:

Notes: