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Topic: Thenardite

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	JAIC , Volume 39, Number 3, Article 2 (pp. to )
		Both mirabilite and thenardite, anhydrous sodium sulfate, grew as prismatic crystals within the solution at high (65%) and low (35%) RH, respectively.
		Although the test temperature is above that normally found in historic buildings, the phase-transition stresses for thenardite might have relevance for rock weathering in desertic areas.
		Conditions required for surface and subsurface crystallization of sodium chloride, leading to flaking or powdering of porous material, have been clearly described by Lewin (1982).
	aic.stanford.edu /jaic/articles/jaic39-03-002.html (7516 words)

	Journal of weekly news and commentaries about rocks and minerals and mineral collecting.
		Soak the minerals for a few minutes,then brush them using an old toothbrush (if they are not delicate), and rinse under running water.
		Be careful to avoid washing minerals that are water soluble including: carnallite, chalcanthite, halite, halotrichite, hanksite, inyoite, kernite, melanterite, nahcolite, natron, sylvite, thenardite, trona, villiaumite.
		If you have an ultrasonic cleaner, you can use that too.
	www.johnbetts-fineminerals.com /jhbnyc/journal.htm (21696 words)

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