Formula: Pb7(Fe,Cu)Al3GeSi12O36(OH,H2O)6
Origin of name: For Mathew Rogers, prospector at Tsumeb
Crystal system: Hexagonal
Crystal class: 3
Twinning:
Unit cell:
Colour: White to pale greenish-yellow
Diaphaneity: Translucent
Luster: Vitreous
Habit: Crystals to 0.3 mm and radiating aggregates to 1 mm, scales, blades
Hardness: 2
Specific gravity: 4.7
Cleavage: 1; {0001} perfect
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Soluble in HNO3
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