CaCO₃

Aragonite, a member of the aragonite group, is extremely rare at MSH.

PHYSICAL CHARACTERISTICS:

Color varies from colorless to white and pinkish yellow.
Luster is vitreous to resinous.
Diaphaneity is transparent to translucent.
Crystal System is orthorhombic; Pmcn.
Crystal Habits include aggregates of tabular crystals to 7mm; and
. as cleavage fragments.
Cleavage: {010} is distinct and {110} is indistinct.
Fracture is subconchoidal.
Hardness is 3.5 – 4.
Specific Gravity is approximately 2.95 g/cm³.
Streak is colorless.
Associated Minerals include analcime, calcite, dolomite,
natrolite, polylithionite, pyrite and siderite.
Distinguishing Features: Crystal habit.
Origin: Named in 1790 after the original locality in Aragon, Spain.

CLASSIFICATION:

REFERENCES:
MinRec 21:296 (1990), Dana 8:442-444 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH          PE          AP          MX          SS           MC          HF           BR          SX          FR
¤¤¤            —             —             —             —               —             —              —             —             —  

Legend