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n. form of silver sulfide

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Acanthite, Ag2S, crystallizes in the monoclinic system and is the stable form of silver sulfide below 173 °C. Argentite is the stable form above that temperature. As argentite cools below that temperature its cubic form is distorted to the monoclinic form of acanthite. Below 173 °C acanthite forms directly. Acanthite is the only stable form in normal air temperature.

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nf. acanthite

Mineralogy Database Dictionary

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General Information:
 Chemical Formula:
(Molecular Weight = 247.80 gm)
Silver 87.06 % Ag
Sulfur 12.94 % 
 Empirical Formula:
 Name Origin:
From the Greek, akanta, meaning "arrow." After the Latin, argentum, meaning "silver". Argentite is stable above 179 C. Acanthite is stable below 179 C.
Physical Properties:
[001] Poor, [110] Poor
lead gray, gray, or black.
7.2 - 7.4, Average = 7.3
Blocky - Crystal shape tends to be equant (e.g. feldspars)., Skeletal - Crystals form crude outlines with missing faces., Arborescent - "Tree like" growths of branched systems (e.g. s ilver).
2-2.5 - Gypsum-Finger Nail
shining black
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Dizionario inglese-italiano 1.0.012

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