Name:

ettringite

A photo of the mineral ettringite

Class:

Sulfosalts

Chemistry:

Ca6Al2(SO4)4 * 24H2O Hydrous Calcium Aluminum Sulfate

Color(s):

clear, yellow

Hardness:

2-2.5

SpecGrav:

1.8

Fracture:

uneven

Cleavage:

perfect

Crystal:

Hexagonal (bipyramids or as fibers)

Envronment:

found in cavities of metamorphosed limestone

Association:

thomsonite, clinohedrite, limestone

Locals:

| New Jersey, Arizona, USA | Ireland | Germany |

Misc:

Named from one of its early locals, Ettringen, Germany.

Photos
& Locals:

1.) N'Chwaning Mine, Kuruman, South Africa
2.) N'Chwaning Mine, Kuruman, South Africa

3.) N'Chwaning Mine, Kuruman, South Africa

TheImage Home
Minerals by Name
Minerals by Class
Gemstones

Photo Information
Crystal Info
Bibliography