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Hydromagnesite Mineral Data

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General Hydromagnesite Information

Help on Chemical  Formula: Chemical Formula: Mg5(CO3)4(OH)2•4(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mg5(CO3)4(OH)2•4(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1835
Help on Locality: Locality: Castle Point, Hoboken, Hudson County, New Jersey, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its chemical composition.
Help on Name Pronunciation: Name Pronunciation: Hydromagnesite + Pronunciation Say HYDROMAGNESITE
Help on Synonym: Synonym: ICSD 920
  PDF 25-513
 

Hydromagnesite Image

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  Hydromagnesite

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

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  Pokrovskite   Hydromagnesite

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

Help on Axial Ratios: Axial Ratios: a:b:c =1.1308:1:0.9373
Help on Cell Dimensions: Cell Dimensions: a = 10.11, b = 8.94, c = 8.38, Z = 2; beta = 114.58° V = 688.78 Den(Calc)= 2.25
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.79(1), 2.899(0.82), 9.2(0.39),
Help on Forms: Forms:

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Help on Above

Forms: ( 1 1 0) ( 0 1 1) ( 1 0 0)

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Physical Properties of Hydromagnesite

Help on Cleavage: Cleavage: {010} Perfect, {100} Distinct
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.16 - 2.2, Average = 2.18
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Fluorescent, Short UV=green, Long UV=bluish white.
Help on Luster: Luster: Silky
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Hydromagnesite

Help on Gladstone-Dale: 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
Ncalc = 1.5 - 1.52
Help on Optical Data: Optical Data: Biaxial (+), a=1.523, b=1.527, g=1.545, bire=0.0220, 2V(Calc)=52, 2V(Meas)=30-90. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
Help on Pleochroism (z): Pleochroism (z): none.
 

Calculated Properties of Hydromagnesite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.29 gm/cc
note: Specific Gravity of Hydromagnesite =2.25 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEHydromagnesite = 0.77 barns/electron
U=PEHydromagnesite x rElectron Density= 1.76 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hydromagnesite is Not Radioactive
 

Hydromagnesite Classification

Help on  Dana Class: Dana Class: 16b.07.01.01 (16b)Carbonates - Hydroxyl or Halogen
  (16b.07)Dana Type
  (16b.07.01)Dana Group
 
16b.07.01.01 Hydromagnesite Mg5(CO3)4(OH)2•4(H2O) P 21/c 2/m
 
16b.07.01.02 Widgiemoolthalite (Ni,Mg)5(CO3)4(OH)2•4-5(H2O) P 21/c 2/m
Help on  Strunz Class: Strunz Class: 05.DA.05 05 - CARBONATES (NITRATES)
  05.D - Carbonates with Additional Anions, with H2O
  05.DA -With medium-sized cations
 
05.DA.05 Dypingite Mg5(CO3)4(OH)2•5(H2O) Unk. Mono
 
05.DA.05 Giorgiosite Mg5(CO3)4(OH)2•5(H2O) ? Mono
 
05.DA.05 Hydromagnesite Mg5(CO3)4(OH)2•4(H2O) P 21/c 2/m
 
05.DA.05 Widgiemoolthalite (Ni,Mg)5(CO3)4(OH)2•4-5(H2O) P 21/c 2/m
 

Other Hydromagnesite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Hydromagnesite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Hydromagnesite

Mg5(CO3)4(OH)2•4(H2O)
Dana No: 16b.07.01.01 Strunz No: 05.DA.05
Locality:

 

Notes:

 

 
   
 


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