Asparagus Stone: A yellow-green form of Apatite.
Assay: A test of the purity of an alloy by scraping a bit of metal from the piece and determining the percentage of gold or silver.
With Asparagus Stone (Spanish), Blue, Cats Eye and Violet Apatite illustrated below: ...
aka Asparagus Stone, Berilo
The name apatite is quite appropriate, considering this mineral makes up the teeth in all vertebrate animals (and teeth are used to satisfy appetite!).
"Phosphate of Lime, asparagus stone, in sulphuret of iron. Phosphate of lime, under some varieties, is found in most of the mines of magnetic iron in New York; it is often in yellowish white, or reddish grains ...
ApatiteApatite (calcium phosphate) is a clear to opaque stone that comes in many colors, including green, yellow, blue, violet, and yellow-green (called asparagus stone). Some apatite stones show a cat's eye asterism.
Apatite is a calcium phosphate that is typically green or blue, but can also be yellow, reddish-brown, violet, yellow-green ("asparagus stone"), colorless, or multicolored.
[1] Chatoyant stones are known as cat's-eye apatite,[1] transparent green stones are known as asparagus stone,[1] and blue stones have been called moroxite.
The green variety is sometimes called "asparagus stone", it is not common in the jewelry trade because it is both soft and very brittle. Mainly purchased by gem collectors.
pairblue stones ...
Apatite
Spanish apatite is often called "asparagus stone" because of its yellowish green color.
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Apatite is Calcium Phosphate combined with fluorine, chlorine or hydroxyl. Spanish Apatite is often called "asparagus stone" due to its yellowish-green color.
Blue stones from Brazil with colors rivalling Paraiba tourmaline are most in demand
A light green variety of apatite carries the trade name "asparagus stone" ...
There is a particularly intense, and deeply saturated, geenish-blue (aka "swiss blue") variety from Madagascar which is known as "neon apatite." There is also a darker, yellowish-green varietie that is sometimes referred to as "asparagus stone.
The color is often due to the presence of rare earth elements and includes green, yellow, blue, violet, and a yellow-green variety, originally mined in Spain, commonly called asparagus stone because of its similarity in color to the vegetable.
 See also: Color, Apatite, Eye, Mineral, Stone
  
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