Hulsite Mineral Data

General Hulsite Information

Chemical Formula:

(Fe++,Mg)2(Fe+++,Sn)O2(BO3)

Composition:

Molecular Weight = 233.09 gm

Magnesium 10.43 % Mg 17.29 % MgO

Iron 45.52 % Fe 30.82 % FeO / 30.83 % Fe₂O₃

Tin 5.09 % Sn 6.47 % SnO₂

Boron 4.64 % B 14.93 % B₂O₃

Oxygen 34.32 % O

______ ______

100.00 % 100.34 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺MgFe³⁺_0.9Sn_0.1O₂(BO₃)

Environment:

Metamorphosed limestone at a granite contact.

IMA Status:

Valid Species (Pre-IMA) 1908

Locality:

Brooks mountain, Seward peninsula, Alaska. Link to MinDat.org Location Data.

Name Origin:

Named for Alfred Hulse Brooks (1871-1924), U. S. Geologist.

Name Pronunciation:

Hulsite

Synonym:

ICSD 12133

PDF 17-511

Hulsite Image

Images:

Hulsite

Comments: Black crystalline granular massive hulsite.
Location: Brooks Range, Seward Peninsula, Alaska, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hulsite Crystallography

Axial Ratios:

a:b:c =3.4477:1:1.7508

Cell Dimensions:

a = 10.695, b = 3.102, c = 5.431, Z = 2; beta = 94.21° V = 179.69 Den(Calc)= 4.31

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/m

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

By Intensity(I/I_o): 2.664(1), 2.585(0.7), 5.35(0.7),

Physical Properties of Hulsite

Cleavage:

{110} Good

Color:

Black.

Density:

4.3

Diaphaneity:

Opaque

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Sub Metallic

Streak:

black

Optical Properties of Hulsite

Optical Data:

NCalc= 2 - from Gladstone-Dale relationship (KC = 0.231) where Ncalc=Dcalc*KC+1
NCalc= 1.99 - from Gladstone-Dale relationship (KC = 0.231) where Ncalc=Dmeas*KC+1

Calculated Properties of Hulsite

Electron Density:

Bulk Density (Electron Density)=4.12 gm/cc
note: Specific Gravity of Hulsite =4.31 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Hulsite= 28.80 barns/electron
U=PE_Hulsite x rElectron Density= 118.64 barns/cc.

Radioactivity:

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

Hulsite Classification

Dana Class:

24.02.03.01 (24)Borates - Anhydrous

(24.02)where (A)2 BO2 [XO3]

(24.02.03)Dana Group

24.02.03.01 Hulsite (Fe,Mg)2(Fe,Sn)O2(BO3) P 2/m 2/m

24.02.03.02 Magnesiohulsite (Mg,Fe)2(Mg,Fe,Sn)O2(BO3) P 2/m 2/m

24.02.03.03 Aluminomagnesiohulsite! Mg2(Al,Mg,Sn)(BO3)O2 P 2/m 2/m

Strunz Class:

06.AB.45 06 - BORATES

06.A - Monoborates

06.AB -BO3, with additional anions; 1(D) + OH, etc.

06.AB.45 Hulsite (Fe,Mg)2(Fe,Sn)O2(BO3) P 2/m 2/m

06.AB.45 Magnesiohulsite (Mg,Fe)2(Mg,Fe,Sn)O2(BO3) P 2/m 2/m

06.AB.45 Aluminomagnesiohulsite! Mg2(Al,Mg,Sn)(BO3)O2 P 2/m 2/m

Other Hulsite Information

References:

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

See Also:

Links to other databases for Hulsite :
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 - HyperPhysics
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Hulsite

(Fe++,Mg)2(Fe+++,Sn)O2(BO3)
Dana No: 24.02.03.01 Strunz No: 06.AB.45
Locality:

Notes:

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