O'Danielite

Alluaudite Group. A synthetic Mg analogue is known: 'Unnamed (Na-Zn-H Arsenate Hydroxyarsenate)'. Ðorðević et al. (2015) published data on the crystal structure of a few synthetic alluaudite-like protonated arsenates, that include the NaZn3(AsO4)(AsO3OH)2 phase. This phase is the synthetic analogue of o'danielite; its structure is based on M1ZnOO4(OH)2 and M2ZnO6 octahedra that share edges to form chains || (101) and linked by the arsenate tetrahedra. The chains form two types of channels || c, one type holding OH groups, and the second one holding Na atoms. Compare 'Unnamed (Na-Zn-H Arsenate Hydroxyarsenate)'.

History

Activities related to discovery and approval of the group members

Structural context

O'Danielite
Crystal System monoclinicCrystal Class prismaticSpace Group C2/c
a12.113
b12.445
c6.793
alpha90
beta112.87
gamma90
volume943.52

Based on 1 measurements

Chemical context

Stoichiometric formulas

O'Danielite
mindat.org
  • March 13, 2023Na(Zn,Mg)3(AsO4)(AsO3OH)2
IMA
  • March 13, 2023Na◻ZnZn2(AsO4)[AsO3(OH)]2
mineralogy.rocks
  • Aug. 30, 2022Na[box]ZnZn2[AsO4][AsO3(OH)]2

Elements recorded on EPMA

1
As
1
H
1
Mg
1
Na
1
O
1
Zn

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • pale violet
Color noteOriginal color note from the source
Pale violet
StreakStreak entities, recognized using a custom trained NER model
    Streak noteOriginal streak note from the source
    White
    Lustre
    Vitreous
    Fracture
    Irregular/Uneven
    Transparency
    Translucent
    Tenacity
    brittle
    Calculated density
    4.49