كاسيتريت: الفرق بين النسختين
| [نسخة منشورة] | [نسخة منشورة] |
تم حذف المحتوى تمت إضافة المحتوى
اضافة لشريط البوابات : كيمياء + علم الأحجار الكريمة والمجوهرات |
لا ملخص تعديل وسمان: تحرير من المحمول تعديل ويب محمول |
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سطر 1:
{{Infobox mineral
| name = Cassiterite
| category = [[Oxide minerals]]
| boxwidth =
| boxbgcolor =
| image = 4447M-cassiterite.jpg
| imagesize =
| caption = Cassiterite with [[muscovite]], from Xuebaoding, Huya, Pingwu, Mianyang, Sichuan, China (size: 100 x 95 mm, 1128 g)
| formula = SnO<sub>2</sub>
| strunz = 04.DB.05
| symmetry = Tetragonal 4/m 2/m 2/m
| unit cell = a = 4.7382(4) Å, c = 3.1871(1) Å; Z=2
| molweight =
| color = Black, brownish black, reddish brown, red, yellow, gray, white; rarely colorless
| habit = Pyramidic, prismatic, radially fibrous botryoidal crusts and concretionary masses; coarse to fine granular, massive
| system = [[Tetragonal]] - Ditetragonal Dipyramidal 4/m 2/m 2/m
| twinning = Very common on {011}, as contact and penetration twins, geniculated; lamellar
| cleavage = {100} imperfect, {110} indistinct; partings on {111} or {011}
| fracture = Subconchoidal to uneven
| tenacity = Brittle
| mohs = 6–7
| luster = Adamantine to adamantine metallic, splendent; may be greasy on fractures
| refractive = n<sub>ω</sub> = 1.990 - 2.010 n<sub>ε</sub> = 2.093 - 2.100
| opticalprop = Uniaxial (+)
| birefringence = δ = 0.103
| pleochroism = Pleochroic haloes have been observed. Dichroic in yellow, green, red, brown, usually weak, or absent, but strong at times
| streak = White to brownish
| gravity = 6.98 - 7.1
| density =
| melt =
| fusibility = infusible
| diagnostic =
| solubility = insoluble
| diaphaneity = Transparent when light colored, dark material nearly opaque; commonly zoned
| other =
| references = <ref name=Handbook>[http://rruff.geo.arizona.edu/doclib/hom/cassiterite.pdf Handbook of Mineralogy]</ref><ref name=Mindat>[http://www.mindat.org/min-917.html Mindat]</ref><ref name=Webmin>[http://webmineral.com/data/Cassiterite.shtml Webmineral]</ref><ref name=Klein>{{cite book |last=Hurlbut |first=Cornelius S. |last2=Klein |first2=Cornelis |year=1985 |title=Manual of Mineralogy |edition=20th |publisher=John Wiley and Sons |location=New York |pages=306–307 |isbn=0-471-80580-7 }}</ref>
}}
[[ملف:4447M-cassiterite.jpg|تصغير|كاسيتريت]]
'''الكاسيتريت''' (cassiterite) هو معدن أكسيد القصدير SnO2 وهو بلون بني ضارب للحمرة يعتبر المصدر الأساسي [[قصدير|للقصدير]]. بدأ تنقيبه في أوروبا في القرن الخامس عشر.
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