Magnesiohulsite Mineral Data

General Magnesiohulsite Information

Chemical Formula:

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

Composition:

Molecular Weight = 188.93 gm

Magnesium 30.87 % Mg 51.20 % MgO

Iron 14.78 % Fe 9.51 % FeO / 10.57 % Fe₂O₃

Tin 6.28 % Sn 7.98 % SnO₂

Boron 5.72 % B 18.42 % B₂O₃

Oxygen 42.34 % O

______ ______

100.00 % 97.67 % = TOTAL OXIDE

Empirical Formula:

Mg_2.4Fe²⁺_0.25Fe³⁺_0.25Sn_0.1O₂(BO₃)

IMA Status:

Approved IMA 1985

Locality:

Link to MinDat.org Location Data.

Name Origin:

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

Name Pronunciation:

Magnesiohulsite

Magnesiohulsite Image

Images:

Magnesiohulsite

Comments: Green fibrous massive magnesiohulsite.
Location: Itenyurgin, Chukot Peninsula, Magadan District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Magnesiohulsite Crystallography

Axial Ratios:

a:b:c =3.4967:1:1.781

Cell Dimensions:

a = 10.7, b = 3.06, c = 5.45, Z = 2; beta = 94.6° V = 177.87 Den(Calc)= 3.53

Crystal System:

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

Physical Properties of Magnesiohulsite

Cleavage:

None

Color:

Black.

Density:

4.18

Diaphaneity:

Transparent to Translucent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

5.5-6.5 - Knife Blade-Pyrite

Luster:

Sub Metallic

Streak:

dark brown

Optical Properties of Magnesiohulsite

Gladstone-Dale:

CI meas= -0.07 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.267 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2592,KPDmeas= 0.2189,KC= 0.2046
Ncalc = 1.72 - 1.86

Optical Data:

Biaxial (?), a=1.88, g=1.95, bire=0.0700

Pleochroism (x):

dark green.

Pleochroism (z):

dark brown.

Calculated Properties of Magnesiohulsite

Electron Density:

Bulk Density (Electron Density)=4.06 gm/cc
note: Specific Gravity of Magnesiohulsite =4.18 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_{Magnesiohulsite}= 22.99 barns/electron
U=PE_{Magnesiohulsite} x rElectron Density= 93.40 barns/cc.

Radioactivity:

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

Magnesiohulsite Classification

Dana Class:

24.02.03.02 (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 Magnesiohulsite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Magnesiohulsite :
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

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

Magnesiohulsite

(Mg,Fe++)2(Mg,Fe+++,Sn++++)O2(BO3)
Dana No: 24.02.03.02 Strunz No: 06.AB.45
Locality:

Notes:

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