ECDEMITE


Meaning of ECDEMITE in English

General Information:

Chemical Formula:

Pb6As+++2O7Cl4

Composition:

(Molecular Weight = 1,646.85 gm)

Arsenic 9.10 % As

Lead 75.49 % Pb

Chlorine 8.61 % Cl

Oxygen 6.80 % O

Empirical Formula:

Pb6As2O7Cl4

Locality:

Langban and Harstig mines, Varmland, Sweden.

Name Origin:

Named from the Greek for "unusual", in reference to the composition.

Physical Properties:

Cleavage:

[001] Perfect

Color:

green yellow, yellow, or orange.

Density:

6.9 - 7.1, Average = 7

Diaphaniety:

Translucent

Habits:

Massive - Uniformly indistinguishable crystals forming large masses., Encrustations - Forms crust-like aggregates on matrix., Tabular - Form dimensions are thin in one direction.

Hardness:

2.5 - Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Streak:

light yellow

More details...

Mineralogy database English vocab.      Английский словарь базы данных минералогии .