Magnesiohulsite Mineral Data

Magnesiohulsite Mineral Data +

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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.

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

Physical Properties of Magnesiohulsite

Cleavage:

None

Color:

Black.

Density:

4.18

Diaphaniety:

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

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:

r_electron=3.43 gm/cc
note: r_{Magnesiohulsite}=3.53 gm/cc.

Fermion Index

Fermion Index = 0.05603
Boson Index = 0.94397

Photoelectric:

PE_{Magnesiohulsite}= 22.99 barns/electron
U=PE_{Magnesiohulsite} x r_electron= 78.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Magnesiohulsite is Not Radioactive

Magnesiohulsite Classification

Dana Class:

24.2.3.2 (24)Borates - Anhydrous

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

(24.2.3)Dana Group

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

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

24.2.3.3 Alumino-magnesiohulsite! Mg2(Al,Mg,Sn)(BO3)O2 P 2/m 2/m

Strunz Class:

V/G.03-30 V - Nitrates, Carbonates and Borates

V/G - "Insel" borates [BO3]3- "inseln"

V/G.03 - Warwickite - Hulsite series

V/G.03-05 Pertsevite! Mg2(BO3)F P na2₁ mm2

V/G.03-10 Warwickite Mg(Ti,Fe,Al)(BO3)O Pnam 2/m 2/m 2/m

V/G.03-15 Yuanfuliite (Mg,Fe)(Fe,Al,Mg,Ti,Fe)(BO3)O Pnam 2/m 2/m 2/m

V/G.03-20 Pinakiolite Mg2MnO2(BO3) C 2/m 2/m

V/G.03-25 Alumino-magnesiohulsite! Mg2(Al,Mg,Sn)(BO3)O2 P 2/m 2/m

V/G.03-30 Magnesiohulsite (Mg,Fe)2(Mg,Fe,Sn)O2(BO3) P 2/m 2/m

V/G.03-40 Hulsite (Fe,Mg)2(Fe,Sn)O2(BO3) 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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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: 24.2.3.2 Strunz No: V/G.03-30
Locality:

Notes: