MINERALOGICAL RESEARCH COMPANY



General physical features of the Fulgurites from Eastern California Desert, Inyo Co., California
Type 1

Very pale “bottle-olive green” color interior, light to medium grey exterior.
One only, very special specimen with Copper inclusions (see #1796).

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:

Fairly straight, to slightly curved down the length

of the specimen, usually equidimensional, tubular.  Secondary branches are uncommon.

Color:

Light to medium gray.

Texture:

Fairly smooth, without ridges or large rocks attached.

Sand Granules:

Small bits of unfused Quartz sand, and occasionally very tiny fragments of white Feldspar are attached.

GLASSY INTERIOR:

Color:

Normal: Very pale “bottle-olive green” color is the normal.   Larger specimens have darker green glassy centers.

Copper inclusions:  One only, very special specimen with Copper inclusions (see #1796).

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”, and as large as 1/2” in diameter on some of the very large specimens.

 

 

Click on photos for larger view

                           


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