Zoisite

UNB-2017-0158Minerals » Silicates » Sorosilicates

Description

Six samples of compact Zoisite with only two of the samples unpolished. Greenish and pink (Thulite) samples. *One sample is missing. Zoisite (Ca2Al3Si3O12(OH)) can be grey, yellowish brown, greenish, pink (Thulite) or blue (Tanzanite). Lustre is vitreous and pearly on the cleavage. Streak is white and hardness is 6 to 6 1/2. Cleavage is good lengthwise. Zoisite tends to occur as prismatic crystals but can also be columnar, bladed, fibrous or compact.

Specifications

Object name	Zoisite
ID	UNB-2017-0158
Legal status	Permanent collection
Category	Mineral
Classification	Mineral group: Silicates Sub-group: Sorosilicates
Composition	Ca2(Al,Fe)3(SiO4)3(OH) (Al,Fe)SiO4 Ca2Al3(SiO4)3(OH) Ca2Al3(SiO4)3(OH)
Origin	Tanzania
Pieces	6
Partial	No
Measurements	5cm x 6cm x 3.5cm 7.5cm x 3.5cm x 3.5cm 6cm x 4cm x 1cm 7cm x 5.5cm x 1cm 6cm x 4cm x 1cm 7cm x 5.5cm x 0.5cm

Map of Origin

Publications

Chesterman, C.W. 1979. Audubon Society, Field Guide to North American Rocks and Minerals. Knopf.