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Mineralpedia Details for Kimuraite-(Y)

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Kimuraite-(Y)

Kimuraite-(Y)

Named for Professor Kenjiro Kimura at the Tokyo University in Japan who made large contributions to rare earth mineralogy. Kimuraite is a rare mineral that can be found only in Japan, Russia, and Sweden. It occurs in fissures in alkalic olivine basalts. Kimuraite crystals fluoresce bright red to purple under both short- and long-wave ultraviolet light.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/kimuraitey.pdf

Formula
CaY2(CO3)4ยท6H2
Crystal System
Orthorhombic 
Crystal Habit
Spherical, Aggregates 
Cleavage
Perfect, None, None 
Luster
Vitreous - Silky 
Color
white, light purple pink, light pink 
Streak
white 
Class
Orthorhombic 
Hardness
2.5 
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Kimuraite-(Y) from Kirigo, Hizen-cho, Higashi-Matsuura-gun, Saga, Kyushu Island, Japan

Kimuraite-(Y)
            from Kirigo, Hizen-cho, Higashi-Matsuura-gun, Saga, Kyushu Island, Japan

White to slightly pinkish silky crystals to 5mm long in matrix.

Lilac colored pearly coatings to 1mm in a 1.5 x 1cm area on basalt. Comes with a two other labels with remarks on fluorescence. There are 6 or 7 worldwide localities.

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Kimuraite-(Y) from Niikoba, Hizen-cho, Higashi-Matsuura-gun, Saga, Kyushu Island, Japan

Kimuraite-(Y)
            from Niikoba, Hizen-cho, Higashi-Matsuura-gun, Saga, Kyushu Island, Japan

Silky white feather-like crystal group in a 15 x 7mm area.

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