Editorial Feature

Minasragrite – Occurrence, Properties and Distribution

Minasragrite is named after the Minasragra locality in Peru where it was first found. Where it was discovered in 1915.

Properties of Minasragrite

The key physical properties of Minasragrite are as below:

  • Cell Data
    • Space group: P21/a
    • a = 12.902(4)
    • b=9.716(5)
    • c=6.976(2)
    • Z = [4]
  • Crystal Data
    • Monoclinic
    • Point group: 2/m
    • Crystals – minute equant crystals that show {001}, {110}, {011}, {101}, {111}; in spherulites and granular masses in delicate efflourescences.
    • X-ray powder pattern: Minasragra, Peru.
      5.135 (100), 3.907 (70), 5.431 (60), 3.826 (35), 3.658 (24), 6.049 (20), 3.509 (17)
  • Chemical Composition
    Elements Content 1 Content 2
    SO3 32 31.64
    V2O5 3 -
    V2O4 29.8 32.77
    H2O 34.5 35.59
    Insol 0.6 -
  • Optical Properties
    • Semitransparent
    • Optical class- Biaxial (-)
    • Lustre – Vitreous
  • Estimated Properties
    Electron density Bulk density (electron density)= 2.07 g/cm3
    note: Specific gravity of Minasragrite = 2.03 g/cm3
    Photoelectric PEMinasragrite = 4.51 barns/electron
    U=PEMinasragrite x ρelectron density= 9.32 barns/cm3
    Fermion index Fermion index = 0.001
    Boson index = 0.99
    GRapi = 0 (Gamma Ray American Petroleum Institute Units)
    Minasragrite is not radioactive

How to Identify Minasragrite

Minasragrite is a vivid cobalt blue colored to aquamarine-blue. It appears blue in transmitted light. It is easily soluble in cold water and exhibits a vitreous lustre. Its hardness ranges between 1 and 2.

Global Distribution

Minasragrite is can be found in the following locations:

  • USA – from North Mesa mine group, Temple mountain district and Emery County, Utah
  • Peru – Minasragra, Cerro de Pasco.

Occurrence of Minasragrite and Useful Mineral Association

Minasragrite occurs as an alteration product of patronite in a rich deposit of vanadium materials and in fissures that cut red shales that were probably filled by a remobilized asphalt deposit; in a silicified tree, formed as an oxidation product of pyrite reacting with vanadium-rich organic material. It is commonly associated with minerals like patronite, melanterite, morenosite, retgersite, potassium alum, gypsum, orthominasgarite, pyrite, szomolnokite, sulfur, iron sulfate.


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