Home > Mineral Descriptions > Johnsenite-(Ce) (TL)



Johnsenite-(Ce) (Type Locality)
Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(OH)3(CO3) · H2O

     Johnsenite-(Ce) is the fourth new member of the eudialyte group in 2005. This group has expanded greatly over the last few years. The description of this new mineral species was published in early 2006 in the Canadian Mineralogist. It was accepted by the International Mineralogical Association as IMA 2004-026, and is the W analogue of zirsilite-(Ce).

PHYSICAL CHARACTERISTICS:

Color is (??).
Luster is vitreous.
Diaphaneity is transparent to translucent.
Crystal System is trigonal;R3m.
Crystal Habits include deeply etched, skeletal crystals to 4mm,
   and aggregates of crystals to 1 cm.
Cleavage is not apparent.
Fracture is uneven.
Hardness is 5 - 6.
Specific Gravity is approximately 3,24 g/cm3.
Streak is white.
Associated Minerals include albite, calcite, pectolite, aegirine,
   fluorapophyllite, zirsilite-(Ce), dawsonite, rhodochrosite, epididymite,
   galena, molybdenite, pyrite, pyrrhotite, quartz, sphalerite,
   stillwellite-(Ce), titanite, cerite-(Ce), tuperssuatsiaite, steacyite,
   catapleiite, zakharovite, natrolite and microcline.
Distinguishing Features: Requires analysis for identification, brittle.
Origin: Named in 2005 for Ole Johnsen, of the Geological Museum,
   University of Copenhagen, Denmark.

CLASSIFICATION:

Dana System
# To follow

Strunz Classification
# To follow

REFERENCES:
CanMin 44:105-115 (2006)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
--

FR
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