Note: Artificially grown "niahite" is sold on the market. It is in fact ammonium dihydrogen phosphate (ADP), also called mono ammonium phosphate (MAP), formula NH4H2PO4. These fakes can be either colored bright green by doping with chromium or in any color by adding water soluble dyes like food coloring (Udo Behner info). The matrix may consist of quartz crystals or any other rock.
History
Activities related to discovery and approval of the group members
Structural context
Niahite
Crystal System orthorhombicCrystal Class orthorhombic pyramidalSpace Group Pmn21
a5.7142—5.7302 (5.7206)
b8.8191—8.8312 (8.8253)
c4.8762—4.9087 (4.8874)
alpha90
beta90
gamma90
volume245.91—248.062 (246.745)
Based on 6 measurements
Chemical context
Stoichiometric formulas
Niahite
mindat.org
March 1, 2025(NH4)Mn2+(PO4)·H2O
March 13, 2023(NH4)(Mn2+,Mg)(PO4)·H2O
IMA
March 13, 2023(NH4)Mn2+(PO4) · H2O
mineralogy.rocks
Aug. 30, 2022(NH4)(Mn2+,Mg)PO4·H2O
Elements recorded on EPMA
6
D
6
Mn
6
N
6
O
6
P
Physical properties
ColorColor entities, recognized using a custom trained NER model
pale orange
Color noteOriginal color note from the source
Pale orange
StreakStreak entities, recognized using a custom trained NER model