4.6.1. irridescent goethite (limonite) Mt Morgan mine Qld Australia. Properties: Variable lustre. Crystals often metallic, other forms submetallic to earthy. Yellowish or reddish brown to black color. Brownish yellow streak. Knife barely scratches massive, stalactitic and botryoidal forms (Mohs Hardness 2.5-3.5) earthy form appears much softer.
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