File:Birds and nature (1902) (14771255733).jpg

Identifier: birdsnature121902chic (find matches)
Title: Birds and nature
Year: 1900 (1900s)
Authors:
Subjects: Birds Natural history
Publisher: Chicago, Ill. : A.W. Mumford, Publisher
Contributing Library: Smithsonian Institution Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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a namemeaning stone from the Amazon river.It first referred probably to jade or somesuch green stone from that locality andthen came to include green Feldspar. Nooccurrence of green Feldspar in thatregion is now known. Practically all the amazonstone nowused for ornamental purposes comesfrom three localities. These are thevicinity of Miask in the Ural Mountains.Pikes Peak, Colorado, and Amelia CourtHouse, Virginia. In all these places theamazonstone occurs in coarse-grainedgranite and is closely accompanied byquartz and Feldspar. All gradationsare found in color from the deep greento white, only the bright green beingprized for ornamental purposes. TheFeldspar is usually well crystallized andcrystals of several pounds weight maybe found. A crystal will rarely beof a uniform color, streaks of palergreen or white being commonly present.Only the uniformly colored portions areprized for ornamental purposes. Thegreen often takes on a bluish tone andblue sometimes even predominates. The 74
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LOANED BY FOOTE 509 Ainazonstone, crvstallized (Colorado). Lal)rad()nte, pnlislied (I.abr.Kloi). Suii-tniH (Norway). FELDSPAR.Amazonstone, crystallized (Colorado). Amazoustone (Colorado). Labradorite, polished (Labrador). Moonstone, polished (Norway). color is doubtless due to some organicmatter, as it disappears, leaving thestone white, on heating. The stone is al-ways opaque. Its use is not extensive,its sale being greater to tourists in thevicinity of the regions where it is foundthan to gem cutters. Several otherlocalities in the United States besidesthose mentioned afford the mineral,though not in large quantities. It oc-curs in two or three localities in NorthCarolina; in Paris, Maine; MountDesert, Maine; Rockport, Massachu-setts ; and Delaware county, Pennsyl-vania. The finest comes from the PikesPeak locality. Mr. G. F. Klunz states inregard to these crystals that when theywere first exhibited at the CentennialExposition in Philadelphia in 1876 theywere a great surprise to Rus

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