Danalite Mineral Data

General Danalite Information

Chemical Formula:

Fe++4Be3(SiO4)3S

Composition:

Molecular Weight = 558.74 gm

Beryllium 4.84 % Be 13.43 % BeO

Iron 39.98 % Fe 51.43 % FeO

Silicon 15.08 % Si 32.26 % SiO₂

Sulfur 5.74 % S 5.74 % S^2-

- % S -2.86 % -O=S

Oxygen 34.36 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺₄Be₃(SiO₄)₃S

IMA Status:

Valid Species (Pre-IMA) 1866

Locality:

Essex Co., Massachusetts, USA. Link to MinDat.org Location Data.

Name Origin:

Named after James Dwight Dana (1813-1895), American mineralogist and author of the Dana mineral classification.

Name Pronunciation:

Danalite

Synonym:

ICSD 201639

PDF 11-491

Danalite Image

Images:

Danalite

Comments: Orange irregular gemmy danalite in matrix.
Location: Iron Mountain, Winston, New Mexico, USA. Scale: See Image.
© Rruff Database

Danalite Crystallography

Cell Dimensions:

a = 8.17, Z = 2; V = 545.34 Den(Calc)= 3.40

Crystal System:

Isometric - HextetrahedralH-M Symbol (4 3m) Space Group: P 43n

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

By Intensity(I/I_o): 3.35(1), 1.932(0.7), 2.193(0.5),

Crystal Structure:

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Hassan I , Grundy H D , American Mineralogist , 70 (1985) p.186-192, The crystal structures of helvite group minerals, (MnFeZn)8(Be6Si6O24)S2

View Additional jPOWD Structure files for Danalite
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [21] [22] [23] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Danalite

Cleavage:

{111} Indistinct

Color:

Brown, Brownish black, Grayish yellow, Pink, Reddish brown.

Density:

3.43

Diaphaneity:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Streak:

gray white

Optical Properties of Danalite

Gladstone-Dale:

CI meas= -0.133 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.143 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2241,KPDmeas= 0.2222,KC= 0.196
Ncalc = 1.67

Optical Data:

Isotropic, n=1.753-1.771.

Calculated Properties of Danalite

Electron Density:

Bulk Density (Electron Density)=3.31 gm/cc
note: Specific Gravity of Danalite =3.43 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Danalite= 12.95 barns/electron
U=PE_Danalite x rElectron Density= 42.94 barns/cc.

Radioactivity:

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

Danalite Classification

Dana Class:

76.02.04.02 (76)Tectosilicate Al-Si Framework

(76.02)Feldspathoids and related species

(76.02.04)Helvite group

76.02.04.01 Helvite Mn4Be3(SiO4)3S P 43n 4 3m

76.02.04.02 Danalite Fe4Be3(SiO4)3S P 43n 4 3m

76.02.04.03 Genthelvite Zn4Be3(SiO4)3S P 43n 4 3m

Strunz Class:

09.FB.10 09 - SILICATES (Germanates)

09.F - Tektosilicates without Zeolitic H2O

09.FB -Tektosilicates with additional anions

09.FB.10 Bicchulite Ca2Al2SiO6(OH)2 I 43m 4 3m

09.FB.10 Danalite Fe4Be3(SiO4)3S P 43n 4 3m

09.FB.10 Hauyne (Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2 P 43n 4 3m

09.FB.10 Genthelvite Zn4Be3(SiO4)3S P 43n 4 3m

09.FB.10 Helvite Mn4Be3(SiO4)3S P 43n 4 3m

09.FB.10 Lazurite Na3Ca(Al3Si3O12)S P 43n 4 3m

09.FB.10 Kamaishilite Ca2Al2SiO6(OH)2 I-lattice Tetra

09.FB.10 Nosean Na8Al6Si6O24(SO4) P 43m 4 3m

09.FB.10 Sodalite Na8Al6Si6O24Cl2 P 43n 4 3m

09.FB.10 Tugtupite Na4AlBeSi4O12Cl I 4 4

09.FB.10 Tsaregorodtsevite N(CH3)4AlSi5O12 I 222 2 2 2

Other Danalite 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 Danalite :
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 Danalite Specimen Label here :

Danalite

Fe++4Be3(SiO4)3S
Dana No: 76.02.04.02 Strunz No: 09.FB.10
Locality:

Notes: