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Monteregianite-(Y)
L. Horváth specimen
Photo by Violet Anderson
© Royal Ontario Museum

Monteregianite-(Y) crystals - click for larger pic
Monteregianite-(Y) crystals
Photo by Violet Anderson
© Royal Ontario Museum

Monteregianite-(Y) crystals - click for larger pic
Monteregianite-(Y) crystals
© Doug Merson

Monteregianite-(Y) crystals - click for larger pic
Monteregianite-(Y) crystals
© Doug Merson

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Home > Mineral Descriptions > Monteregianite-(Y) (TL) - (7 Photos)



Monteregianite-(Y) (Type Locality)
(Na,K)6(Y,Ca)2Si16O38 · 10H2O

     Mont Saint-Hilaire is the type locality for monteregianite-(Y) and still the only locality.

PHYSICAL CHARACTERISTICS:

Color ranges from colorless, pale to dark gray, pale rose or violet, and
   white to nearly black. Some crystals are zoned pink or green.
Luster is vitreous (colorless, rose and violet) or greasy to silky for the
   others.
Diaphaneity is transparent (colorless, rose and violet) and the others
   are translucent to opaque.
Crystal System is monoclinic (pseudo-orthorhombic); P21/n.
Crystal Habits include well formed, sharp, tabular or lath-shaped
   crystals forming attractive radiating sprays, parallel stacked groups
   and aggregates.
Cleavage {010} is perfect, {001} is very good and {100} is fair.
Fracture (??).
Hardness is 3.5
Specific Gravity is approximately 2.4g/cm3
Streak is white.
Associated Minerals include aegirine, albite, amphibole group,
   apophyllite series, arfvedsonite, ashcroftine, astrophyllite, calcite,
   catapleiite, donnayite, elpidite, ewaldite, fluorite, genthelvite,
   harmotome, labuntsovite, lorenzenite, microcline, molybdenite,
   narsarsukite, natrolite, nenadkevichite, pectolite, phlogopite,
   polylithionite, pyrite, quartz, rhodochrosite, sepiolite, sphalerite,
   steacyite and titanite.
Distinguishing Features: Intense green fluorescence under SW.
Origin: Named in 1978 for the Monteregian Hills, which include
   the type locality.

CLASSIFICATION:

Dana System
# 72.5.1.2

Strunz Classification
# VIII/H.38-10

REFERENCES:
CanMin 16:561-565 (1978), AmMin 72:365-374 (1987),
MinRec 21:323 (1990), Dana 8:1539-1540 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
¤¤

AP
--

MX
¤¤

SS
--

MC
¤¤

HF
--

BR
¤¤

SX
--

FR
--

Legend

Monteregianite-(Y) crystals - click for larger pic
Monteregianite-(Y) crystals
© Stephan Wolfsried

Monteregianite-(Y) crystals - click for larger pic
Monteregianite-(Y) crystals
© Bill Lechner

Monteregianite-(Y) crystals - click for larger pic
Monteregianite-(Y) crystals
© Jason B. SMith