Formula: Ba2NaCe2Fe(Ti,Nb)2Si8O26(OH,F) . H2O
Origin of name: After locality; Joaquin ridge, Diablo Mnts., California
Crystal system: Monoclinic
Crystal class: 2
Twinning: Common on {001}, polysynthetic
Unit cell: a = 10.52 Ǻ, b = 9.69 Ǻ, c = 11.83 Ǻ, β = 110.7°
Colour: Honey-yellow to brown
Diaphaneity:
Luster: Vitreous
Habit: Crystals tabular to equant
Hardness: 5.5
Specific gravity: 3.89
Cleavage: 1; {001} good
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments: Dimorphous with orthojoaquinite
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