Cadwaladerite is a rare aluminium halide mineral, first described in 1941 from the Victoria Segunda mine Cerros Pintados, Iquique province in Tarapacá Region, Chile. The mineral was named after Charles Meigs Biddle Cadwalader, President of the Academy of Natural Sciences.
Properties of Cadwaladerite
The following are the key properties of Cadwaladerite:
- Crystal Data
- Point Group: n.d
- Granular and in small masses, embedded in halite
- Chemical Composition
|-O = Cl2
- Optical Properties
- Transparent to translucent
- Color: Lemon-yellow
- Luster: Vitreous
- Optical Class: Isotropic
- n = 1.513, variable
- Estimated Properties
||Bulk density (electron density) = 1.73 g/cm3
note: Specific gravity of Cadwaladerite = 1.66 g/cm3
||PECadwaladerite = 1.92 barns/electron
U= PECadwaladerite x ρElectron density = 3.33 barns/cm3
||Fermion index = 0.0002
Boson index = 0.99
||Cadwaladerite is not radioactive
How to Identify Cadwaladerite
Cadwaladerite is a transparent, lemon-colored mineral, having a vitreous luster. It is reported to have conchoidal fractures characterized by smoothly curving surfaces.
The density of cadwaladerite is 1.66 g/cm3.
Cadwaladerite is distributed on the mine dumps at Cerro Pintados, 80km southeast of Iquique, Tarapaca, Chile.
Occurrence of Cadwaladerite and Useful Mineral Association
Cadwaladerite occurs in a sulfate deposit, embedded in halite, and is closely associated with gypsum and halite.