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Caysichite-(Y)

#PD33688

Caysichite-(Y)

#PD33688
Availability
Sold
Size
4 x 4.5 x 4 cm - Miniature 
Formula
(Ca,Yb,Er)4Y4Si8O20(CO3)6(OH)·7H2O (RRUFF)
Locality
Evans-Lou mine, Wakefield Lake, Quebec, Canada
Tagged
carbonate , REE mineral

White prismatic Caysichite-(Y) crystals in radial sprays to 1mm or less in the tiny open vugs in REE pegmatite matrix. The Evans Lou pegmaitite was originally mined from 1939 to 1952 for feldspar, when 25,000 tons were mined. It was mined later for silica when a 20x40 mass wwas mined. A lot of the Rare Earth minerals were thought to come from this quartz mass or near the contact with perthite. Evans Lou is a unique pegmatite enriched in yitrium-niobium-bismuth-vanadium. Huge Allanite crystals were mined here, one crystal was 4x2 ft.

This is a fantastic specimen with soapy white radial crystal groups to 1mm in size with good definition and open spaces between the groups. Cross-sections and terminations are visible.

This is one of the impossible to prounounce minerals with seemingly jumbled letters, in this case abbreviations of the minerals's chemical forumula are juxtaposed {Ca(Calcium)-Y(Yttrium)-Si(Silica)-Ch(Charbonate)} to make the name.

Type Locality

Caysichite-(Y)

Formula
(Ca,Yb,Er)4Y4Si8O20(CO3)6(OH)·7H2
Crystal System
Orthorhombic 
Crystal Habit
Pulverulent, Reniform, Stalactitic 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, green, greenish yellow, white, light yellow 
Streak
white 
Class
Orthorhombic - Pyramidal 
Hardness
4.5 

Data courtesy of Webmineral.

Collection
Phillips Collection
Special Info
Type Locality

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