Mineralpedia Details for Dresserite

Named to honor John Alexander Desser, a Canadian geologist who made large contributions to the knowledge of the Monteregian Hills in which Dresserite finds its type locality at the Francon quarry in the central part of the City of Montreal in Quebec, Canada. The Francon quarry is Dresserite’s only locality where it occurs in vugs in an alkalic sill in limestone. Assocaited minerals include weloganite, dawsonite, quartz, and plagioclase.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/dresserite.pdf

Formula

Ba₂Al₄(CO₃)₄(OH)₈·3H₂O 

Crystal System

Orthorhombic 

Luster

Vitreous - Silky 

Color

white 

Streak

white 

Class

Orthorhombic - Dipyramidal 

Hardness

2.5-3 

WebMineral

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Mindat

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White divergent sprays of fibrous crystals to 9mm.