Surinamite Mineral Data

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

Environment:

In mylonitic mesoperthite gneiss, probably formed during high-pressure granulite facies metamorphism of aluminous rocks.

IMA Status:

Approved IMA 1976

Locality:

From the Bakhuis Mountains, Surinam. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Surinamite + Pronunciation

Synonym:

ICSD 31212

PDF 38-433

Surinamite Image

Images:

Surinamite

Comments: PPL thin-section image of blue surinamite (Sur) enclosing orthopyroxene (Opx) and sillimanite (Sil) with corderite (Crd), and quartz (Qtz). AmMin, v65:1474.
Location: South Harris Igneous Complex, N.W. Scotland. Scale: Picture Size 1.2 mm.
© American Mineralogist

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 - Prismatic H-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),

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
Ncalc = 1.74

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:

Bulk Density (Electron Density)=3.53 gm/cc
note: Specific Gravity of Surinamite =3.59 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Surinamite= 3.62 barns/electron
U=PE_Surinamite x rElectron Density= 12.81 barns/cc.

Radioactivity:

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

Surinamite Classification

Dana Class:

69.02.01b.02 (69)Inosilicate Chains with Side Branches or Loops

(69.02)with P>2

(69.02.01b)Aenigmatite and related species (Sapphirine subgroup)

69.02.01b.01 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1

69.02.01b.02 Surinamite (Mg,Fe)3Al4BeSi3O16 P 2₁/n 2/m

69.02.01b.03 Khmaralite! (Mg,Al,Fe)16(Al,Si,Be)12O40 P 2₁/c 2/m

Strunz Class:

09.DH.55 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DH -Inosilicates with 4-periodic single chains, Si4O12

09.DH.55 Surinamite (Mg,Fe)3Al4BeSi3O16 P 2₁/n 2/m

Other Surinamite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Surinamite :
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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Print or Cut-and-Paste your Surinamite Specimen Label here :

Surinamite

(Mg,Fe++)3Al4BeSi3O16
Dana No: 69.02.01b.02 Strunz No: 09.DH.55
Locality:

Notes:

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