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Jarosite coatings
1,2 mm
© Doug Merson
Jarosite coatings
© Modris Baum
Jarosite coatings
© Modris Baum
KFe3+(SO(OH)
Jarosite, a member of the alunite group, is moderately rare at
Mont Saint-Hilaire.
PHYSICAL CHARACTERISTICS:
Color is usually yellow.
Luster is dull to resinous.
Diaphaneity is translucent.
Crystal System is hexagonal;
Crystal Habits include powdery coatings on feldspar crystals.
Cleavage {001} is distinct.
Fracture is conchoidal to uneven.
Hardness is 2.5 – 3.5
Specific Gravity is approximately 3.15 g/cm
Streak is yellow.
Associated Minerals include gypsum.
Distinguishing Features: none.
Origin: Named in 1852 after its discovery locality, in Baranco
Jaroso, Sierra Almagrera, Spain.
CLASSIFICATION:
Dana System
# 30.2.5.1
Strunz Classification
# VI/B.11-60
REFERENCES:
MinRrec 21:315 (1990), Dana 8:634-635 (1997)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:
MSH
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