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Meridianiite Mineral Data

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General Meridianiite Information

Help on Chemical  Formula: Chemical Formula: MgSO4•11H2O
Help on Composition: Composition: Molecular Weight = 318.54 gm
   Magnesium   7.63 %  Mg   12.65 % MgO
   Hydrogen    6.96 %  H    62.21 % H2O
   Sulfur     10.07 %  S    25.14 % SO3
   Oxygen     75.34 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg(SO4)•11(H2O)
Help on Environment: Environment: Frozen pond on waters high in MgSO4 below 2 Deg C. Dehydrates to amorphous sodium sulfate or kieserite. Decomposes above 2 Deg C to epsomite and water.
Help on IMA Status: IMA Status: Approved IMA 2007 (Dana # Added)
Help on Locality: Locality: Venables Valley, 20 km SSW of Ashcroft, British Columbia, Canada Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: The name, meridianiite, was chosen to reflect the locality on Mars where the MER rover Opportunity observed crystal molds in sedimentary rock that are thought to be caused by minera ls that have since dehydrated or disso
Help on Synonym: Synonym: Fritzsche's salt

Meridianiite Image

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Comments: Red arrow points meridianiite on the underside of a post in a frozen pond. Ice, in the form of snow covers the top of the post and the frozen pond surface (AmMin, v92:1757). This in an analoge for probable Martian occurrences.
Location: The ponds are on the Basque claims, which occur in a small valley in the Thompson region of central British Columbia. Scale: See Image.
© American Mineralogist

Meridianiite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9895:1:2.5347
Help on Cell Dimensions: Cell Dimensions: a = 6.7459, b = 6.8173, c = 17.2799, Z = 2; alpha = 88.137°, beta = 89.481°, gamma = 62.719° V = 705.89 Den(Calc)= 1.50
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.958(1), 4.85(0.9), 4.91(0.84),2.94(0.67), 2.988(0.58), 5.62(0.56), 5.41(0.54), 5.73(0.35),

Physical Properties of Meridianiite

Help on Color: Color: White.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: white

Optical Properties of Meridianiite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2887,KC= 0.2813
Ncalc = 1.42
Help on Optical Data: Optical Data: Biaxial (?), a=1.418, g=1.448, bire=0.0300

Calculated Properties of Meridianiite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.60 gm/cc
note: Specific Gravity of Meridianiite =1.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0087572862
Boson Index = 0.9912427138
Help on Photoelectric: Photoelectric: PEMeridianiite = 0.96 barns/electron
U=PEMeridianiite x rElectron Density= 1.54 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Meridianiite is Not Radioactive

Meridianiite Classification

Help on  Dana Class: Dana Class: (29)Hydrated Acid and Sulfates
  (29.06)where A XO4 � x(H2O)
  (29.06.14)Dana Group Meridianiite! MgSO4•11H2O P1 1
Help on  Strunz Class: Strunz Class: 07.CB.90 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CB -With only medium-sized cations
07.CB.90 Meridianiite! MgSO4•11H2O P1 1

Other Meridianiite Information

Help on References: References: NAME( AmMin, v92:1756) PHYS. PROP.(AmMin, v92:1756) OPTIC PROP.(AmMin, v92:1756)
Help on See Also: See Also: Links to other databases for Meridianiite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 07.CB.90





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