MnAl(SO(OH)22· 8H
Shigaite, formerly UK # 76, is relatively rare at MSH.
PHYSICAL CHARACTERISTICS:
Color is usually pale brown.
Luster is vitreous.
Diaphaneity is transparent to translucent.
Crystal System is hexagonal, 3.
Crystal Habits include tabular hexagonal crystals forming rosettes.
Cleavage {0001} is perfect.
Fracture is flexible.
Hardness is 2.
Specific Gravity is approximately 2.3 g/cm
Streak is very light yellow to white.
Associated Minerals include kupletskite, microcline and UK # 58.
Distinguishing Features: Cystal habits
Origin: Named in 1985 after its discovery locality, at the Ioi mine, Shiga,
Honshu, Japan.
CLASSIFICATION:
Dana System
# 31.1.2.1
Strunz Classification
# VI/D.14-22
REFERENCES:
Dana 8:639 (1997)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:
MSH
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