Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
14 Cards in this Set
- Front
- Back
|
RI |
154 |
|
|
Amber is |
Fossilized tree fossilized tree resins, a mixture of hydrocarbons, plus resins, succinic acid, and oils |
|
|
Luminescence |
Yellow in SW (Texas) Bluish white or greenish in LW Grayish blue in SW (Baltic) |
|
|
Luster |
Resinous |
|
|
Durability & Fashioning |
Cleavage none Hardness 2.5 Stability poor Toughness poor |
|
|
Inclusions |
Plant debris Small animals Insects and spiders Minerals, liquids & gases |
|
|
How do you know that the insect was not placed in after woods |
You are looking for a struggle |
|
|
Treatments 5 |
Heat treatment Clarification Dyeing Burning Coating |
|
|
Heat treatment |
Used in order to darken the surface of amber to reddish-brown. |
|
|
Clarification |
90% of all amber is treated to the improve its clarity this is done buy heating in rape seed oil. Untreated amber with tiny bubbles that can be so small that they cannot be resolved under a microscope is called bastard amber. The appearance of sun spagles is a side effect. Amber also may be clarified by heating under pressure with nitrogen and then baking in an oven |
|
|
Dyeing |
Typically red or green |
|
|
Burning |
The backs of cabochons may be burnt to make the amber look green or almost black. If this burnt area is partly polished away the amber can look red. |
|
|
Coatings |
Epoxy resins may be used. Often worn or peeled areas can be seen under a microscope. |
|
|
Composits |
Ambroloid or pressed amber is reconstructed smaller pieces of amber pressed together though a steell |
