5951 - Ganophyllite

At-A-Glance

Country of Origin

NJ
United States

Photos

Essential Information

Specimen ID

5951

Mineral Name

Ganophyllite

Chemical Formula

(K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7•8-9(H2O)

Subcollection

Franklin and Sterling Hill Suite
Associated Minerals
Bustamite
Axinite
Marsturite
Willemite
Associated Rock Matrix
Willemite and franklinite ore
Specimen Number
001

Index card lists mineral species as ganophyllite, bustamite, and axinite.
Type locality for marsturite

Axinite-Mn forms a crust of radiating orange blade-like crystals on and interspersed with 4 mm euhedral tabular pink bustamite/rhodonite crystals. The bustamite/rhodonite crystals are partially rimmed by an epitaxial growth of light brown marsturite. Several 2-4 mm transparent willemite crystals and clusters of dark brown ganophyllite are also dispersed through the axinite-Mn crust. These minerals form a several mm thick crust on the surface of foliated high-grade zinc ore (franklinite, willemite). The specimen measures approximately 14 x 14 x 8 cm.

Geographic Origin

Locality Nickname

Franklin, New Jersey

Locality Lat/Long

41.1220409, -74.5804378

Mining District

Franklin Mining District

Mine Name

Franklin Mine