Sanidine – מילון אנגלי-אנגלי

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Sanidine

Sanidine is the high temperature form of potassium feldspar with a general formula K(AlSi₃O₈). Sanidine is found most typically in felsic volcanic rocks such as obsidian, rhyolite and trachyte. Sanidine crystallizes in the monoclinic crystal system. Orthoclase is a monoclinic polymorph stable at lower temperatures. At yet lower temperatures, microcline, a triclinic polymorph of potassium feldspar, is stable.

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Webster's Revised Unabridged Dictionary (1913)

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Sanidine

(n.)
A variety of orthoclase feldspar common in certain eruptive rocks, as trachyte; -- called also glassy feldspar.

Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About

Mineralogy Database

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Sanidine

General Information:

Chemical Formula:
(K,Na)(Si,Al)4O8

Environment:
Acid volcanic rocks.

Locality:
Common world wide occurrences.

Name Origin:
From the Greek sanis - "little plate" and idos - "to see."
Physical Properties:

Cleavage:
[001] Perfect, [010] Good

Color:
colorless, white, gray, yellowish white, or reddish white.

Density:
2.52

Diaphaniety:
Transparent to translucent

Habits:
Blocky - Crystal shape tends to be equant (e.g. feldspars)., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Massive - Granular - Common texture observed in granit e and other igneous rock.

Hardness:
6 - Orthoclase

Luminescence:
Non-fluorescent.

Luster:
Vitreous - Pearly

Streak:
white
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Glosarium Pusat Bahasa Depdiknas Indonesia

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sanidine

B: (Kimia) sanidina

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Sanidine – מילון אנגלי-עברי

Sanidine – מילון אנגלי-אנגלי