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| Product Name: |
Dravite Tourmaline
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| Supply Ability: |
more ten thousands ton |
| Related proudcts |
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| Specifications |
more |
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General Description
Dravite is a little known species of the Tourmaline Group. Chemistry: NaMg3(Al,Fe)6Si6O18(BO3)3(OH)4, complex Sodium Magnesium Iron Boro-Aluminium Silicate
Appearance
Crystal or Powder
Origins
Notable Occurances include China, Brazil and some other South American countries, and Africa
Applications
mineral collection specimens
Important Properties
Color is light brown to dark brown.
Crystal Habit is typically elongated three sided prisms. The terminations can be either a simple to complex trigonal pyramid or a flat basal face. The prism faces are striated lengthwise. In cross section, all tourmalines will appear predominantly triangular in shape with some crystals showing a hexagon. Doubly terminated crystals are hemimorphic meaning that the two ends of the crystal are not exactly alike. Massive forms can also be found.
Tran***rency: crystals are translucent to opaque.
Crystal System is Trigonal; 3m
Hardness is 7 - 7.5
Specific Gravity is 3.2+ (slightly heavier than average)
Cleavage is absent although there is basal parting.
Fracture is uneven to conchoidal.
Luster is vitreous.
Associated Minerals include those associated with metamorphic rocks such as micas, feld***rs and quartz.
Other Characteristics: crystals are brittle and refractive indices = 1.62 and 1.68 .
Notable Occurances include brazil and some other South American countries, and Africa.
Best Field Indicators are crystal habit, triangular cross-section, color and hardness.
In addition to the standard range of tourmaline product above GWM can manufacture tourmaline grades tailored to customers specific require |
| Company: |
Great Wall Mineral
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| Contact: |
Mr. lenny sun |
| Address: |
2208, 4th Building, Renhe Jiayuan£¬28 East Huai'an Road |
| Postcode: |
050000 |
| Tel: |
86-311-86128822 |
| Fax: |
86-311-86126662 |
| E-mail: |
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