General Information:
Chemical Formula:
NaCa5H4(AsO4)5·4(H2O)
Composition:
(Molecular Weight = 994.07 gm)
Sodium 2.31 % Na
Calcium 20.16 % Ca
Arsenic 37.68 % As
Hydrogen 1.22 % H
Oxygen 38.63 % O
Empirical Formula:
NaCa5H4(AsO4)5·4(H2O)
IMA Status:
Approved IMA 1981
Locality:
Ste.-Marie-aux-Mines, Vosges Mountains, Alsace, France.
Name Origin:
Named for Elizabeth McNear, mineralogist and crystallographer, University of Geneva, Switzerland.
Physical Properties:
Cleavage:
[???] Perfect
Color:
white.
Density:
2.6
Habits:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Fibrous - Crystals made up of fibers.,
Luster:
Pearly
Streak:
white
More details...