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Columnar jointing is a geological structure where sets of intersecting closely spaced fractures, referred to as joints, result in the formation of a regular array of polygonal prisms, or columns. Columnar jointing occurs in many types of igneous rocks and forms as the rock cools and contracts. Columnar jointing can occur in cooling lava flows and ashflow tuffs (ignimbrites), as well as in some shallow intrusions. Columnar jointing also occurs rarely in sedimentary rocks if they have been heated by nearby hot magma.
The columns can vary from 3 meters to a few centimeters in diameter, and can be as much as 30 meters tall. They are typically parallel and straight, but can also be curved and vary in diameter. An array of regular, straight, and larger-diameter columns is called a colonnade; an irregular, less-straight, and smaller-diameter array is termed an entablature. The number of sides of the individual columns can vary from 3 to 8, with 6 sides being the most common.

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  1. S

    Pegler prestex and jointing compound

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  2. CorgiDirect

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  3. S

    Cast iron soil pipe jointing method

    Evening all, I’ve been asked to replace a cast iron stack on a listed building. The customer has ordered the required materials, I’ve just got to install it. What’s the modern day method to seal the joints? Thanks
  4. E

    Jointing Compound On 15mm Plastic To Brass Compression Fitting?

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  5. A

    Best jointing compound ??

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  6. S

    Thoughts on jointing compound for compression fittings?

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  7. S

    jointing copper to black iron gas pipe (red)

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  8. Gas74

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  9. Eyespy999

    Jointing compound

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  10. C

    Jointing plastic strap boss to cast stack.

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  11. S

    Isolation valve

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  12. S

    Weeping compression fittings

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  13. D

    copper pipe jointing

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  14. B

    jointing pastes / compounds

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  15. N

    which jointing compound

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  16. M

    No tape or jointing compound on shower pump!!!

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  17. R

    Whats your preferred gas jointing compound?

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  18. P

    best jointing compound

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  19. R

    jointing compound help please

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  20. cr0ft

    Jointing PVC to Pitch Fibre Drains

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