AMETHYST 'TWINNING' STONE BRAZIL 3.75 CTS [ST6735]
- SKU
- Afmetingen (mm)
- 13.000 x 10.000 x 4.000mm
- Gewicht (cts)
- Certified Gemstones
- Nee
- Kleuren
-
SEDA GEMS
AMETHYST TWINNING STONE
This is a natural stone which has some interesting lines in it from its formation.
Mined in Brazil.
Well polished
Nice collectors stone.
Weight 3.75 cts app
Size 13 x 10 x 4 mm app
TWINNING
Twinning form as a result of an error during crystallization. Instead of a "normal" single crystal, twins will often appear doubled where two crystals appear to be growing out of or into each other, like Siamese twins. Some twins however are not even identifiable outwardly and some minerals in fact have been found to be just a twinned variety of another mineral. Accidental relationships are not considered twins, such as when two distinct crystals grow more or less randomly side-by-side or toward each other, etc. Also epitaxial overgrowths are also not twins. These occur when one mineral of similar structure, but different chemistry, grows onto and "continues" the earlier mineral's crystal.. Twins are recognized by penetration angles or notches in the crystal, mirror planes that do not normally occur on a specific mineral and crystallographic techniques not normally available to the average collector. Twinning often has a dramatic effect on the outwardsymmetry of the mineral either by raising or lowering the symmetry. Twinning can make an orthorhombic mineral appear hexagonal or make a trigonal mineral appear monoclinic.
Amethyst is a purple form of quartz and it is the Birthstone associated with February..Amethyst occurs in primary hues from a light slightly-pinkish violet to a deep grape purple. Amethyst may exhibit one or both secondary hues, red and/or blue. The ideal grade is called "Deep Siberian" and has a primary purple hue of around 75–80 percent, 15–20 percent blue and (depending on the light source) red secondary hues
- SKU
- Afmetingen (mm)
- 13.000 x 10.000 x 4.000 mm
- Gewicht (cts)
- Certified Gemstones
- Nee
- Kleuren
-
SEDA GEMS
AMETHYST TWINNING STONE
This is a natural stone which has some interesting lines in it from its formation.
Mined in Brazil.
Well polished
Nice collectors stone.
Weight 3.75 cts app
Size 13 x 10 x 4 mm app
TWINNING
Twinning form as a result of an error during crystallization. Instead of a "normal" single crystal, twins will often appear doubled where two crystals appear to be growing out of or into each other, like Siamese twins. Some twins however are not even identifiable outwardly and some minerals in fact have been found to be just a twinned variety of another mineral. Accidental relationships are not considered twins, such as when two distinct crystals grow more or less randomly side-by-side or toward each other, etc. Also epitaxial overgrowths are also not twins. These occur when one mineral of similar structure, but different chemistry, grows onto and "continues" the earlier mineral's crystal.. Twins are recognized by penetration angles or notches in the crystal, mirror planes that do not normally occur on a specific mineral and crystallographic techniques not normally available to the average collector. Twinning often has a dramatic effect on the outwardsymmetry of the mineral either by raising or lowering the symmetry. Twinning can make an orthorhombic mineral appear hexagonal or make a trigonal mineral appear monoclinic.
Amethyst is a purple form of quartz and it is the Birthstone associated with February..Amethyst occurs in primary hues from a light slightly-pinkish violet to a deep grape purple. Amethyst may exhibit one or both secondary hues, red and/or blue. The ideal grade is called "Deep Siberian" and has a primary purple hue of around 75–80 percent, 15–20 percent blue and (depending on the light source) red secondary hues
Verzend provider | Verzending naar Australia | Verzending naar de rest van de wereld |
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FedEx | $12.00 / 3 | $39.00 / 10 |
Australia
FedEx krijgt korting op $12.00 bij bestellingen met 2 of meer artikelen
Rest van de wereld
FedEx krijgt korting op $39.00 bij bestellingen met 2 of meer artikelen
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Registered Shipping | $9.00 / 7 | $16.00 / 21 |
Australia
Registered Shipping krijgt korting op $9.00 bij bestellingen met 2 of meer artikelen
Rest van de wereld
Registered Shipping krijgt korting op $16.00 bij bestellingen met 2 of meer artikelen
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Positief
Good stone great service
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Positief
Great thank very much, lovely pearls.
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Positief
Nice piece of rough. thankyou
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Positief
Nice stone. Thankyou
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Positief
Have received the rough. Nice colour. Thankyou