Lorenzenite
Na₂Ti₂Si₁₄O₉

     Lorenzenite is fairly common at MSH. This species is very similar in morphology and color to vinogradovite, in both the bladed and fibrous habits and to ashcroftine in the fibrous habit. Lorenzenite is far more abundant and it fluoresces under SW.

PHYSICAL CHARACTERISTICS:

Color is pale violet, pink, grayish pink, white to colorless and
   dark reddish brown.
Luster is vitreous to silky on bladed crystals and silky on
   acicular crystals.
Diaphaneity is transparent to translucent.
Crystal System is orthorhombic; R3m.
Crystal Habits include superb sword-shaped, bladed crystals and
   very thin fibrous acicular crystals to 1.5 cm.
Cleavage {100} is perfect and {110} is good.
Fracture is uneven.
Hardness is 6
Specific Gravity is approximately 3.45g/cm³
Streak is white.
Associated Minerals include aegirine, albite, amphibole group,
   ashcroftine, bastnäsite, biotite, burbankite, calcite, chlorite group,
   elpidite, fluoroapatite, leucophanite, microcline, molybdenite,
   monteregianite, narsarsukite, pectolite, pyrite, quartz, siderite,
   stillwelite, titanite and yofortierite.
Distinguishing Features: Fluoresces pale yellowish white under SW.
   Luster and radiating crystal habit.
Origin: Named in 1897 for Johannes Theodor Lorenzen (1855-1884),
   Danish mineralogist and student of Greenland mineralogy.

CLASSIFICATION:

REFERENCES:
MinRec 21:319 (1990), AmMin 72: 173-177 (1987), Dana 8:1312 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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