Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Lonsdaleite shopping experience:

1. Compare - without doubt the biggest advantage that the Lonsdaleite offers shoppers today is the ability to compare thousands of Lonsdaleite at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.

2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about

3. Testimonials - don't know anybody that has bought a Lonsdaleite? Wrong! If the Lonsdaleite is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.

4. Questions - Got a question about Lonsdaleite then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....

5. Reputation - Never heard of the company selling Lonsdaleite? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Lonsdaleite and build up a picture of their reputation for sales, returns, customer service, delivery etc.

6. Returns - still worried that even after all of the above your Lonsdaleite wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.

7. Feedback - happy with your Lonsdaleite then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.

8. Security - check for the yellow padlock on the Lonsdaleite site before you buy, and the s after http:/ /i.e. https:// = a secure site

9. Contact - got a question about Lonsdaleite, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.

10. Payment - ready to pay for your Lonsdaleite, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.



Lonsdaleite is an allotrope of carbon with a hexagonal lattice, believed to form when meteoric graphite falls to Earth. The great heat and stress of the impact transforms the graphite into diamond, but retains graphite's hexagonal crystal crystal lattice. Lonsdaleite was first identified from the Canyon Diablo meteorite at Barringer Crater (also known as Meteor Crater) in Arizona. It was first discovered in 1967. Lonsdaleite occurs as microscopic crystals associated with diamond in the Canyon Diablo meteorite; Kenna meteorite, New Mexico; and Allan Hills (ALH) 77283, Victoria Land, Antarctica meteorite. It has also been reported from the Tunguska impact site, Russia.

Lonsdaleite is also known as "hexagonal diamond." It is transparent brownish-yellow in color and has an refractive index from 2.40 to 2.41, a specific gravity from 3.2 to 3.3, and a Mohs hardness scale of 7–8. The Mohs hardness of diamond is 10; the lower hardness of lonsdaleite is chiefly attributed to impurities and imperfections in the naturally occurring material. It can also be created by the thermal decomposition of a polymer, poly(hydridocarbyne), at atmospheric pressure under argon starting at 110 °C.

Lonsdaleite was named in honour of Kathleen Lonsdale.

Crystal Structure Lonsdaleite has a hexagonal crystal system unit cell, related to the diamond unit cell in the same way that the hexagonal and cubic Close-packing crystal system are related.

The diamond structure can be considerred to be made up of interlocking rings of six carbon atoms, in the chair conformation. In Lonsdaleite some of the rings are in the boat conformation instead.

A diagram of the structure of lonsdaleite can be viewed here: .A diagram of the structure of diamond can be viewed here: .

See also

References | last = Anthony | first = J.W. | coauthors = ''et al'' | year = 1995 | title = Mineralogy of Arizona | edition = 3rd.ed. -->
 

Lonsdaleite



 
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