Harmotome

Harmotome is a mineral, one of the rarer zeolites; a hydrated barium silicate with formula: (Ba0.5,Ca0.5,Na,K)5Al5Si11O32·12(H2O). It forms vitreous white well defined monoclinic crystals, often associated with calcite and other zeolites. It has a Mohs hardness of 4 to 5 and a specific gravity of 2.44 to 2.5.
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(n.)
A hydrous silicate of alumina and baryta, occurring usually in white cruciform crystals; cross-stone.
  

General Information:
 Chemical Formula:
(Ba,Na,K)1-2(Si,Al)8O16·6(H2O)
 Composition:
(Molecular Weight = 723.89 gm)
Barium 18.97 % Ba
Aluminum 7.45 % Al
Silicon 23.28 % Si
Hydrogen 1.67 % H 
Oxygen 48.62 % O 
 Empirical Formula:
BaAl2Si6O16·6(H2O)
 Environment:
Alteration product of basalt and similar eurptive rocks.
 IMA Status:
Approved IMA
 Locality:
Bodenmais in Bavaria, Germany.
 Name Origin:
From the Greek harmos - "I combine" and temseis - "I cut" alluding to the fact that the pyramid divides parallel to the plane that passes through the terminal edges.
Physical Properties:
 Cleavage:
[010] Good, [001] Fair
 Color:
white, gray, yellow, red, or brown.
 Density:
2.44 - 2.5, Average = 2.46
 Diaphaniety:
Subtransparent to translucent
 Habits:
Twinning Common - Crystals are usually twinned., Cruciform - Twinned tabular crystals with a cross-like outline., Striated - Parallel lines on crystal surface or cleavage face.
 Hardness:
4-5 - Fluorite-Apatite
 Luminescence:
Fluorescent.
 Luster:
Vitreous (Glassy)
 Streak:
white
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harmotome
danh từ (khoáng chất) hacmotom
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Eng: harmotome
Urdu: ہار موٹوم ۔ اُبال پَتھّر خاندان سے تعلّق رکھنے والا معدن ۔