Hureaulite

Hureaulite Group. Originally sometimes called huréaulite; spelling re-defined by Burke (2008). Study of Gatta (2016) on the material from Jocão pegmatite shows that in the structure there are/is: (1) 5 independent H sites, (2) no zeolitic water, (3) two water molecules standing for vertices of (Mn,Fe) octahedra, (4) only divalent Fe, (5) complex hydrogen bonding system. Iron occupies mostly the M2 site. One of two currently (status: June 2024) approved Mn hydroxophosphate minerals (compare manganonewberyite).

History

Activities related to discovery and approval of the group members

Structural context

Hureaulite
Crystal System monoclinicCrystal Class prismaticSpace Group C2/c
a17.594—17.674 (17.626)
b9.086—9.152 (9.1158)
c9.404—9.512 (9.4689)
alpha90
beta96.56—96.67 (96.61)
gamma90
volume1493.14—1528.516 (1511.333)

Based on 3 measurements

Chemical context

Stoichiometric formulas

Hureaulite
mindat.org
  • March 13, 2023Mn2+5(PO3OH)2(PO4)2·4H2O
IMA
  • March 13, 2023Mn2+5(PO3OH)2(PO4)2 · 4H2O
mineralogy.rocks
  • Aug. 30, 2022Mn2+5(PO4)2(PO3OH)2·4H2O

Elements recorded on EPMA

2
H
2
Mn
2
O
2
P
1
Ca
1
Fe
1
Mg

Physical properties

ColorColor entities, recognized using a custom trained NER model
    • colorless
    • amber
    • orange-red
      • reddish brown
      • yellowish brown
      • violet-rose
      • gray
      Color noteOriginal color note from the source
      Commonly pink to colorless, also red, orange, orange-red, reddish brown, yellowish brown, violet-rose, amber, gray
      StreakStreak entities, recognized using a custom trained NER model
        Streak noteOriginal streak note from the source
        Nearly white
        Lustre
        Vitreous
        Sub-Vitreous
        Greasy
        Fracture
        Irregular/Uneven
        Transparency
        Transparent
        Translucent
        Tenacity
        brittle
        Hardness
        5
        Measured density
        3.15—3.2
        Calculated density
        3.23