Strontiojaoquinite

Formula: Sr₂Ba₂(Na,Fe)₂Ti₂Si₈O₂₄(O,OH)₂.H₂O

Origin of name: from strontium and joaquinite

Crystal system: monoclinic

Crystal class: 2

Twinning: 

Unit cell: a = 10.52 Å, b = 9.76 Å, c = 11.87 Å, b = 109.3°

Colour: green to yellow-green, yellow-brown

Diaphaneity: 

Luster: 

Habit: crystals pseudo-orthorhombic, bipyramidal, zoned with joaquinite cores

Hardness: 5.5

Specific gravity: 3.68

Cleavage: 1; {001} good

Tenacity: 

Streak: 

Synonyms/varieties:

Comments: dimorphous with strontio-orthojoaquinite