Hydromagnesite Mineral Data

Hydromagnesite Mineral Data +

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General Hydromagnesite Information

Chemical Formula:

Mg5(CO3)4(OH)2·4(H2O)

Composition:

Molecular Weight = 467.64 gm

Magnesium 25.99 % Mg 43.09 % MgO

Hydrogen 2.16 % H 19.26 % H₂O

Carbon 10.27 % C 37.64 % CO₂

Oxygen 61.58 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₅(CO₃)₄(OH)₂·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1835

Locality:

Castle Point, Hoboken, Hudson County, New Jersey, USA Link to MinDat.org Location Data.

Name Origin:

Named after its chemical composition.

Synonym:

ICSD 920

PDF 25-513

Hydromagnesite Image

Images:

Hydromagnesite

Comments: White, blocky crystals of hydromagnesite.
Location: Lobming, Styria, Austria. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Hydromagnesite Pokrovskite

Comments: Tan spherical pokrovskite on serpentinite rock with white hydromagnesite sprays.
Location: KCA Quarry, San Benito County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hydromagnesite Crystallography

Axial Ratios:

a:b:c =1.1308:1:0.9373

Cell Dimensions:

a = 10.11, b = 8.94, c = 8.38, Z = 2; beta = 114.58° V = 688.78 Den(Calc)= 2.25

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 5.79(1), 2.899(0.82), 9.2(0.39),

Forms:

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Physical Properties of Hydromagnesite

Cleavage:

[010] Perfect, [100] Distinct

Color:

Colorless, White.

Density:

2.16 - 2.2, Average = 2.18

Diaphaniety:

Transparent

Fracture:

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

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

3.5 - Copper Penny

Luminescence:

Fluorescent, Short UV=green, Long UV=bluish white.

Luster:

Silky

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Hydromagnesite

Gladstone-Dale:

CI meas= -0.055 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2363,KPDmeas= 0.2439,KC= 0.2311

Optical Data:

Biaxial (+), a=1.523, b=1.527, g=1.545, bire=0.0220, 2V(Calc)=52, 2V(Meas)=30-90. Dispersion none.

Pleochroism (x):

none.

Pleochroism (y):

none.

Pleochroism (z):

none.

Calculated Properties of Hydromagnesite

Electron Density:

r_electron=2.29 gm/cc
note: r_{Hydromagnesite}=2.25 gm/cc.

Fermion Index

Fermion Index = 0.02741
Boson Index = 0.97259

Photoelectric:

PE_{Hydromagnesite}= 0.77 barns/electron
U=PE_{Hydromagnesite} x r_electron= 1.76 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hydromagnesite is Not Radioactive

Hydromagnesite Classification

Dana Class:

16b.7.1.1 (16b)Carbonates - Hydroxyl or Halogen

(16b.7)Dana Type

(16b.7.1)Dana Group

16b.7.1.1 Hydromagnesite Mg5(CO3)4(OH)2·4(H2O) P 2₁/c 2/m

16b.7.1.2 Widgiemoolthalite (Ni,Mg)5(CO3)4(OH)2·4-5(H2O) P 2₁/c 2/m

Strunz Class:

V/E.01-10 V - Nitrates, Carbonates and Borates

V/E - Water-bearing carbonates with unfamiliar anions

V/E.01 - Hydromagnesite - Brugnatellite series

V/E.01-10 Hydromagnesite Mg5(CO3)4(OH)2·4(H2O) P 2₁/c 2/m

V/E.01-15 Widgiemoolthalite (Ni,Mg)5(CO3)4(OH)2·4-5(H2O) P 2₁/c 2/m

V/E.01-20 Dypingite Mg5(CO3)4(OH)2·5(H2O) Unk. Mono

V/E.01-30 Giorgiosite Mg5(CO3)4(OH)2·5(H2O) ? Mono

V/E.01-40 Artinite Mg2(CO3)(OH)2·3(H2O) C 2 or C 2/m Mono

V/E.01-50 Indigirite Mg2Al2(CO3)4(OH)2·15(H2O) Unk. Mono

V/E.01-60 Coalingite Mg10Fe2(CO3)(OH)24·2(H2O) R 3c 3 2/m

V/E.01-70 Brugnatellite Mg6Fe(CO3)(OH)13·4(H2O) P 6₃/mmc 6/m 2/m 2/m

Other Hydromagnesite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Hydromagnesite

Mg5(CO3)4(OH)2·4(H2O)
Dana No: 16b.7.1.1 Strunz No: V/E.01-10
Locality:

Notes: