LLANITE - ROCK SLAB (RS2876)

Description

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Llanite
Llanite from the
dike
on
Texas State Highway 16
Llanite is a porphyritic rhyolite with distinctive phenocrysts of blue quartz (a rare quartz color) and perthitic feldspar (light grayish-orangish). The brown, fine-grained groundmass consists of very small quartz, feldspar, and biotite mica crystals.
Llanite comes from a hypabyssal porphyritic rhyolite dike that intrudes Precambrian metamorphics in the Llano Uplift of central Texas. Published radiometric dating on this llanite indicates that it's 1.106 billion years old (late Mesoproterozoic).
The quartz crystals found in llanite are blue hexagonal
bipyramids
. The unusual blue coloration of the quartz is thought to be due to
ilmenite
inclusions.
It is named after
Llano County, Texas
, the only place where it is found.
[1]
Description: This Llanite has the prettiest blue and brown combination of colors and takes an awesome high polish.  There are a few areas of natural void, but still lots of material to work with.  This slab is nice and thick for high dome cabochons.
Measurements:  5 1/4"
x 3" at its widest points x 8 mm thick.
Weight: 156 grams (5.5 oz).
*** P
ease pay attention to the actual sizes given above as the pictures are usually enlarged to show details (i.e. fractures, vugs, crystal pockets, fortification lines, etc.).***
Open Box Policy:
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Disclaimer: Our photos are generally taken indoors using natural light as our primary light source. The side with the inventory number is always taken natural dry, and the reverse side is always taken wet to show any flaws and how it should look when polished. Occasionally they are taken outdoors, in the same manner to show off translucency and coloration. The photos you are viewing are taken with an
Iphone
6 camera and minimal editing has been applied. We try to represent the "rock" from a natural and realistic perspective.
We want all our customers to be satisfied with our products; however, we are not responsible for slight discrepancies between the photos provided and the actual product. Rocks and minerals hold natural inherent flaws; major flaws will be listed. You will always receive the item pictured and described unless otherwise noted. Color, hue and texture significantly affect the value of a piece of rough.
We want your 100% satisfaction!