. . essential ingredient of the stone. This min-eral is known as Lazuhte and in composition is a sihcateof soda and almuina with a small quantity of sodium sul-phide. Amber is a fossil gum of trees of the genus Pinus, andis thus a vegetable rather than mineral product. In colorit is yellow varying to reddish, brownish, and whitish. Itshardness is 2 to , it being slightly harder than g^psumand softer than calcite. It camiot be scratched by thefinger nail, but easily and deeply with a knife. It is alsobrittle. The specific gravity o
. . essential ingredient of the stone. This min-eral is known as Lazuhte and in composition is a sihcateof soda and almuina with a small quantity of sodium sul-phide. Amber is a fossil gum of trees of the genus Pinus, andis thus a vegetable rather than mineral product. In colorit is yellow varying to reddish, brownish, and whitish. Itshardness is 2 to , it being slightly harder than g^psumand softer than calcite. It camiot be scratched by thefinger nail, but easily and deeply with a knife. It is alsobrittle. The specific gravity of amber is scarcely greater thanthat of water, the exact specific weight being thus almost floats in water, especially sea water. It istransparent to translucent. ^lalacliite is a green opaque mineral whose color indi-cates a salt of copper. It is a carbonate of copper con-taining water, the percentages being in the typical mineral,cupric oxide , carbon dioxide , and water Itis the common form which copper assumes when it or even.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
