الجيولوجى المصرى EgyGeologist
منتدى الجيولوجى المصرى يرحب بزائره الكريم..
هذه الرساله تفيد بانك غير مسجل..
برجاء التسجيل للاستفاده المشتركه..كى تستطيع التعليق على الموضوعات ...ولتقييمنا...
وايضا لإرسال جديد المنتدى اليك
التسجيل مجانا ولن يستغرق ثوانى...كى نستطيع الاستمرار فى تقديم الخدمه
مطلوب مشرفين ومديرين .............
الجيولوجى المصرى
Dear Sir,
Register plz.

الجيولوجى المصرى EgyGeologist

لكل المهتمين بعلوم الارض والجيولوجيا ,علوم ,تعدين ,خامات ,مناجم ,اكسسوار ,معدات ,مكياج ,تجميل ,مقالات ,ازياء,صناعات ,كيميا,متاحف ,ديكور ,اثار,مصر,القبطيه,الاسلاميه,الفرعونيه,اخبار,تاريخ,سياحه,
 
الرئيسيةالبوابةاليوميةس .و .جبحـثدخولالتسجيل
المتواجدون الآن ؟
ككل هناك 3 عُضو متصل حالياً :: 0 عضو مُسجل, 0 عُضو مُختفي و 3 زائر :: 1 روبوت الفهرسة في محركات البحث

لا أحد

أكبر عدد للأعضاء المتواجدين في هذا المنتدى في نفس الوقت كان 54 بتاريخ الأحد سبتمبر 25, 2011 2:06 am
المواضيع الأكثر شعبية
جنوب سيناء بالصور(شرم دهب كاترين طابا نويبع)
تليفونات الفنادق والقرى السياحيه وتصنيفها بشرم الشيخ
طريقة عمل الاكلير بالصور
الفن الإسلامي في العصر الأموي 41-132هـ
المتحف القبطى من الداخل بالصور
نافورات للمنازل رائعه
كل شئ عن مراحل تصنيع الاسمنت البورتلاندى .....ببساطه
المتحف المصرى بالصور
كتالوج فساتين زفاف .....يجنن
كتاب عن المعادن وخصائصها
سحابة الكلمات الدلالية
خريطة الشيخ متحف احدث envi الصخور العصر سيناء القبطى طريقة الملك الديكورات كتاب اكسسوار التعدين الفن الكاولين الزجاج المعادن المقدس خرائط الاسمنت العباسي الاول المتحف جنوب
المواضيع الأخيرة
المواضيع الأكثر نشاطاً
متحف الاقصر>>Luxor Museum>
كتالوج فساتين زفاف .....يجنن
نسيج ومنسوجات
الموسوعه الكيميائيه
النهر
المتحف القبطى من الداخل بالصور
الغريب وغير الألوف فى الديكورات.....ديكورات مفتكسه
الفحم الحجرى
How to Mine and Prospect for Placer Gold By J.M. West Foreword
الموسوعه المبسطه للجيولوجيا
عنوانا على الفيس بوك

شاطر | 
 

 Kyanite Mineral Uses & Properties

استعرض الموضوع السابق استعرض الموضوع التالي اذهب الى الأسفل 
كاتب الموضوعرسالة
المدير العام
المدير العام
المدير العام


عدد المساهمات : 1713
السٌّمعَة : 1
تاريخ التسجيل : 26/08/2011

28092011
مُساهمةKyanite Mineral Uses & Properties

Kyanite
Mineral Uses & Properties







Kyanite is a metamorphic mineral that most often forms from the high
pressure alteration of clay-rich sedimentary rocks. It is found in the
schists and gneisses of regionally metamorphosed areas and less often
in quartzite or eclogite.


Kyanite's typical habit is a bladed crystal although it sometimes
occurs as radiating masses of crystals. Kyanite is often associated
with other metamorphic minerals such as garnet, staurolite and corundum.





Kyanite's Unusual Hardness




Kyanite specimens have a variable hardness. The long crystals have a
hardness of about 4.5 to 5 if tested parallel to the length of a crystal
and a hardness of 6.5 to 7 if tested across the short dimension of a
crystal. The mineral was once commonly called "disthene" which means
"two strengths".






Polymorphs of Al2SiO5






Three minerals have a chemical composition of Al2SiO5
These are kyanite, andalusite, and sillimanite. Kyanite is the high pressure
polymorph, sillimanite forms at high temperature and andalusite is the
low pressure polymorph.









Many Industrial Uses of Kyanite





Kyanite is used to manufacture a wide range of products.
An important use is in the manufacture of refractory
products such as the bricks, mortars and kiln furniture used in
high temperature furnaces. For foundries, the molds that are
used for casting high temperature metals are often made with kyanite.



Kyanite is also in products used in the automotive and railroad industries
where heat resistance is important. Mullite, a form of calcined kyanite,
is used to make brake shoes and clutch facings.








Use in High Refractory Strength Porcelain





Kyanite has properties that make it exceptionally well suited for the
manufacture of a high refractory-strength porcelain - a porcelain that
holds its strength at very high temperatures. A familiar use of
this type of porcelain is the white porcelain
insulator on a spark plug.


Kyanite is also used in some of the more common forms of porcelain, such as
those used to make dentures, sinks and bathroom fixtures.





Use in Abrasive Product





Kyanite's heat resistance and hardness makes it an excellent
material for use in the manufacture of grinding wheels and cutting
wheels. It is not used as the primary abrasive, instead it is
used as part of the binding agent that holds the abrasive particles together in the shape of a wheel.







Expansion of Kyanite When Heated






Kyanite, unlike most other minerals, can expand significantly when heated.
Depending upon particle size, temperatures and heating conditions, kyanite can expand
to up to twice its original volume when heated.
This expansion is predictable. In the manufacture of certain refractory
products, specific amounts of kyanite are added to the raw material (which
shrinks during heating) to maintain volume in the finished product.







Kyanite Use as a Gemstone





Occasionally, clear and colorful kyanite is encountered. This material is highly prized by
those who cut gemstones. It can be cut en cabochon, faceted, or used to produce beads and pendants.
Kyanite is considered to be an "exotic" gemstone because it is not often used in jewelry. Photos of Kyanite Gemstones.













Kyanite is often cut "en cabochon" or as a faceted gemstone. Kyanite Photos











A very common habit of kyanite is blue bladed crystals. Kyanite Photos











Green bladed kyanite is also common. Kyanite Photos












The porcelain insulator on this spark plug was made with kyanite.

© iStockphoto / Juergen Barry












Kyanite is used in the porcelain of sanitary fixtures.
© iStockphoto / Carl Kelliher











Kyanite is used as a heat resistant binding medium in cutting tools and grinding wheels.
© iStockphoto / Ron Sumners
الرجوع الى أعلى الصفحة اذهب الى الأسفل

 مواضيع مماثلة

-
» التغذية المعدنية Mineral nutrition
مُشاطرة هذه المقالة على: Excite BookmarksDiggRedditDel.icio.usGoogleLiveSlashdotNetscapeTechnoratiStumbleUponNewsvineFurlYahooSmarking

Kyanite Mineral Uses & Properties :: تعاليق

رد: Kyanite Mineral Uses & Properties
مُساهمة في الأربعاء سبتمبر 28, 2011 11:10 pm من طرف المدير العام
Kyanite - Mineral Properties and Uses





Uses

Kyanite is most often
used where heat resistance is important. It is used to make high
refractory strength porcelain, refractory bricks and mortars, kiln
furniture, brake shoes, clutch facings, grinding wheels, cutting disks.
It is also used in standard porcelain of dentures, sinks and bathroom
fixtures. When kyanite is highly transparent and of attractive color it
can be cut into cabochon and faceted gemstones.
Color

blue, white, gray, green, colorless
Streak

white, colorless
Luster

vitreous, pearly
Diaphaneity

transparent to translucent
Cleavage

perfect in two directions, faces sometimes striated
Hardness

Kyanite often occurs in long,
bladed crystals. These have a hardness of 4.5 to 5 along the length of
the crystals and 6.5 to 7 across the width of the crystals.
Specific Gravity

3.5 - 3.7
Distinguishing
Characteristics


color, cleavage, bladed crystals
Crystal System

triclinic
Chemical Classification

Silicate - Nesosilicate
Chemical Composition

Al2SiO5 (kyanite is polymorphic with sillimanite and andalusite)
رد: Kyanite Mineral Uses & Properties
مُساهمة في الأربعاء سبتمبر 28, 2011 11:11 pm من طرف المدير العام



Kyanite is often cut as a gemstone. Shown above are kyanite
cabochons ranging in color from clear, to blue to green and black. Photos of kyanite gemstones.









Blue bladed kyanite from Minas Gerais, Brazil. Specimen is approximately two inches (5 centimeters) across.


















Green kyanite blades in quartzite from Avery County, North
Carolina. Specimen is about four inches (ten centimeters) across.







Green bladed kyanite (same specimen as above) - looking down the
long axis of the blades. Specimen is about 4 inches (10 centimeters)
across.







Sometimes kyanite occurs as radiating masses of crystals such as
this specimen from Petaca, New Mexico. Specimen is about 4 inches (ten
centimeters) across.
 

Kyanite Mineral Uses & Properties

استعرض الموضوع السابق استعرض الموضوع التالي الرجوع الى أعلى الصفحة 

صفحة 1 من اصل 1

صلاحيات هذا المنتدى:لاتستطيع الرد على المواضيع في هذا المنتدى
الجيولوجى المصرى EgyGeologist :: هندسه وجيولوجيا :: خامات . معادن . صخور-
انتقل الى: