Datolite, a member of the gadolinite group, is on the list of rear minerals found in Canada.
Color varies from pale yellow to greenish-yellow and white.
Luster is vitreous and dull on spheres.
Diaphaneity: transparent to translucent.
Crystal System is monoclinic; P21/a.
Crystal Habits include excellent short prismatic crystals to 20mm
and spheres with radiating internal structure to 1mm.
Cleavage none observed.
Fracture is uneven to conchoidal.
Hardness is 5 – 5.5
Specific Gravity is approximately 3.0 g/cm3.
Streak is white.
Associated Minerals include albite, amphibole group, apophyllite
series, chlorite group, fluorite, hibschite and pectolite.
Distinguishing Features: Color and lack of cleavage.
Origin: Named in 1806 from the Greek datyshai, to divide, alluding
to the granular habit of massive specimens.
MinRec 21:305 (1990), Dana 8:1121-1122 (1997)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:
MSH PE AP MX SS MC HF BR SX FR
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