Bafertisite

Formula:  Ba(Fe,Mn)₂TiSi₂O₇(O,OH)₂

Origin of name:  Combination of symbols of elements

Crystal system:  Monoclinic

Crystal class:  m

Twinning: Ubiquitous on {001}, polysynthetic

Unit cell: a = 10.612 Å, b = 13.637 Å, c = 12.464 Å, b = 119.49°

Colour:  Bright, yellowish red to light brown, orange

Diaphaneity: Semitransparent

Luster:

Habit:  Crystals acicular in aggregates, simple rhombic with elongation along [100] and flattened on {001}

Hardness:  5

Specific gravity:  3.96 to 4.25

Cleavage:  {001} perfect

Tenacity:

Streak:

Synonyms/varieties:

Comments: Forms a series with hejtmanite. Found in hydrothermal veins, in dikes of microcline granite-aplite.