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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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(Molecular Weight = 247.80 gm)
Silver 87.06 % Ag
Sulfur 12.94 % S
From the Greek, akanta, meaning "arrow." After the Latin, argentum, meaning "silver". Argentite is stable above 179 C. Acanthite is stable below 179 C.
 Poor,  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
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