Images of specimens

Plates from George D. Louderback's 1909 Article on Benitoite

Crystal illustrations
View the 72K or 734 image.

Explanation of the crystal illustrations
View the 57 or 479 image.

Benitoite. -- 1 and 2. Gem in ordinary reflected light, natural size; 3. in transmitted light, extraordinary ray; 4. in transmitted light, ordinary ray. 5. Crystals in matrix, 4/5 nat..
View the 100Kimage.

Natrolite, botryoidal aggregate. Slightly reduced.
View the 92K or 671K image.

Natrolite druse showing equant groups perched on soda amphibole fibers. Natural size.
View the 59K or 468K image.

Natrolite, crystalline aggregate, tabular habit. Natural size.
View the 72K or 518 image.

Neptunite prism in natrolite druse. The inner pure white natrolite is separated from the soda amphibole rock by a layer of greenish natrolite.
View the 57K or 411K image.

Portion of vein split open to show drusy interior. Benitoite and neptune crystals, and white natrolite veinstone partially coated with a limonite film. About 1/9 natural size.
View the 69K or 531K image.

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