MINERALOGICAL RESEARCH COMPANY



General physical features of the Fulgurites from Eastern California Desert, Inyo Co., California
Type 2

Medium to dark charcoal gray, to black.

GENERAL INFORMATION ABOUT THE LOCALITY:

This exciting find was made several years ago, quite by accident.  The tendency for specimens from this find is to form as elongated, single tubes, sometimes slightly curved, but most often fairly straight down the length of the tube.  Branches are uncommon.  The finder was kind enough to provide the accompanying photos of the dig site.  These fulgurites were recovered from a sandy area where, in at least one case, an excavation more than 10 feet deep was made in order to recover the entire fulgurite!

OUTSIDE SURFACE:

Form:

Small specimens: Fairly straight, to slightly curved down the length  of the specimen, usually equidimensional, tubular.  Small, secondary branches are uncommon.
Large specimens: Multi-branched, or convoluted.

Color:

Medium to dark charcoal gray, to black.

Texture:

Small specimens: Fairly smooth, without ridges or large rocks attached.
Large specimens: Rough, often convoluted.

Sand Granules:

Small specimens: Small bits of unfused Quartz sand  are attached.
Large specimens: Small fragments of very rough desert rock are also attached.

GLASSY INTERIOR:

Color:

Glassy, charcoal gray, to dark brown-black, to very shiny black. 

Texture:

Where the fulgurites are tubular and open, the texture of the glass is very smooth and shiny.

Bubbles (Gas Pockets) Present:

Numerous, ranging from microscopic to 3/8, up to 1/2 in diameter on some of the very large specimens.

Click on photos for larger view
 
 


 

                           


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