Gottardiite

Formula:  Na₃Mg₃Ca₅Si₁₁₇Al₁₉O₂₇₂ ^. 93H₂O

Origin of name:   For Glauco Gottardi, Italian mineralogist

Crystal system:  Orthorhombic

Crystal class:  2/m 2/m 2/m

Twinning:

Unit cell:

Colour:  Colourless to light yellow

Diaphaneity:  Transparent

Luster: 

Habit:  Thin lamellae elongate [100] or pseudohexagonal in aggregates

Hardness:

Specific gravity:  2.14

Cleavage:  1; {001} perfect

Tenacity:

Streak:  White

Synonyms/varieties:

Comments: