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url url url url
  2. Weltenzyklopädie
  3. سنگ گچ - ویکی‌پدیا، دانشنامهٔ آزاد
سنگ گچ - ویکی‌پدیا، دانشنامهٔ آزاد
از ویکی‌پدیا، دانشنامهٔ آزاد
سنگ گچ
Fibrous gypsum selenite showing its translucent property
اطلاعات کلی
رده‌بندیSulfate minerals
فرمول شیمیایی
(بخش تکراری)		CaSO4·2H2O
دسته‌بندی شرونتس-نیکل07.CD.۴۰
دستگاه بلوریMonoclinic 2/m – Prismatic
گروه فضاییMonoclinic 2/m
ساختار بلوریa=۵٫۶۷9(5) Å, b=۱۵٫۲۰2(14) Å, c=۶٫۵۲2(6) Å; β=۱۱۸٫۴۳°; Z=۴
ویژگی‌ها
رنگColorless to white; may be yellow, tan, blue, pink, brown, reddish brown or gray due to impurities
رفتار بلوریMassive, flat. Elongated and generally prismatic crystals
دوقلوییVery common on {110}
شکستگیConchoidal on {100}, splintery parallel to [001]
TenacityFlexible, inelastic.
سختی موس1.5–2 (defining mineral for 2)
جلاVitreous to silky, pearly, or waxy
رنگ خاکهWhite
شفافیتTransparent to translucent
وزن مخصوص۲٫۳۱–۲٫۳۳
ویژگی‌های ظاهریBiaxial (+)
ضریب شکستnα=۱٫۵۱۹–۱٫۵۲۱
nβ=۱٫۵۲۲–۱٫۵۲۳
nγ=۱٫۵۲۹–۱٫۵۳۰
دوشکستیδ=۰٫۰۱۰
چندرنگ‌نماییNone
2V angle۵۸°
Fusibility۵
انحلال‌پذیریHot, dilute HCl
متغیرهای اصلی
Satin sparPearly, fibrous masses
سلنیت (کانی)Transparent and bladed crystals
رخام گچیFine-grained, slightly colored

سنگ گچ یک ماده معدنی بسیار نرم است که از فشرده شدن کلسیم سولفات دو هیدرات درست می‌شود و یکی از بزرگ‌ترین معادن آن در ایران (سمنان) است. فرمول شیمیایی آن: CaSO۴ · ۲ H۲O

ژیپس که نام دیگر سنگ گچ است در کشاورزی برای از بین بردن شوری خاک و افزایش راندمان خاک مورد استفاده قرار می‌گیرد.

نگارخانه

منابع

آیکون خرد

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