petrified wood
Detailed sheet
petrified wood
This is a fossilized wood dating back 200 million years, all parts of a trunk or branches have been silicified, that is to say that the organic components have been gradually replaced by silica in the form of jasper, chalcedony, or more rarely opal, there are no organic parts left , all living matter has been replaced by stone : we find the growth rings, the cell walls or worm holes.
Its characteristics are those of the mineral which pseudomorphs the wood : silica. This is what we call a “petrified wood” in the common language.
CHEMICAL CHARACTERISTICS
SiO2
microcrystalline silica
PHYSICAL CHARACTERISTICS
Main color
brown
Other colors
white, blue, grey, yellow, red, purple
its color is usually brown, reddish brown, with whitish veinlets and even blue ...
Color of streak
white
Luster
greasy
Hardness
6.5 to 7.0
Density
2.60 to 2.70
Cleavage
none
Fracture
granular, uneven
OPTICAL PROPERTIES
Transparency
opaque
Refractive index
0.000 - 0.000
Double refraction
0.000
refractive index illegible, zero birefringence
visible double refraction
No
Pleochroism
absent
Number of colors
1
Fluorescence
none
CRYSTALS PROPERTIES
microcrystalline aggregates
crystals system
trigonal
OTHER INFORMATIONS
Astrological sign
Sagittarius, Scorpio
APPROACHING GEMS
Exploited
sites
There are many around the world, the Hollbrook forest (Arizona, USA) is best known because of its impact on tourism, with trunks 65 meters long ( 71 Yards ) and 3 meters in diameter ( 3.28 Yards ), but there are tens of deposits in this country alone.
Note that many of these deposits (part of the Arizona forest, national Park since 1962) are preserved and therefore do not produce commercial material.
The woods from Madagascar also reach large dimensions but are less colorful.
use in jewelry
Slices of very large trunks can be mounted as table tops but it is also used to make rings, pendants, earrings, and bracelets mounting fragments … and it is also used to make a quantity of everyday or decorative objects such as : ashtrays, cups, bookends, paperweights, boxes …
Daily care
and precautions
Very easy, resistant to household products.
Historical
healing properties
It would be a calm stone, of quiet happiness, which is “rooted” in the soil.
It would be recommended to people distracted or that lack memory. It would be in relation with the skeleton as the wood of trees, and promote the intellectual development of children and would have a beneficial influence on their growth.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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