Ancylite-(Ce)

Formula:  SrCe(CO3)2(OH).H2O

Origin of name:  From Greek for curved

 

Crystal system:  Orthorhombic

Crystal class:  2/m 2/m 2/m

Twinning:

Unit cell:   a = 5.062 Å, b = 8.586 Å, c = 7.303 Å

 

Colour:  Colourless, gray, pale pink, pale yellow to brownish red

Diaphaneity: Transparent to translucent

Luster:  Vitreous, greasy

Habit:  Crystals stout to long prismatic, elongated along c-axis, minute pseudo-octahedral crystals with curved faces, grains

Hardness:  4 to 4.5

Specific gravity:  3.95 to 4.1

Cleavage:  None

Tenacity:  Brittle

Streak: White

 

Synonyms/varieties:

 

Comments: 

 

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