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Lapidary / Gemstone Community Forum
February 21, 2019, 08:45:02 pm
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Llanite

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Author Topic: Llanite  (Read 152 times)
Taogem
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« on: November 13, 2018, 09:53:39 pm »


This cab is from a little piece of Llanite.

It is named after Llano County, Texas. The unusual blue coloration of the quartz is thought to be due to ilmenite inclusions.



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cabster
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« Reply #1 on: November 14, 2018, 12:11:10 am »

Very nice. This Llanite is something new to me.
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« Reply #2 on: November 14, 2018, 12:26:05 am »

I think this is a rather unique and special piece of Llanite you have. Most all this material I have seen has the blue colored quartz in a brown like matrix.
Very pretty cab.


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Taogem
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« Reply #3 on: November 14, 2018, 02:17:25 am »

That is how I remember it also Terry.. I have cabbed that brown looking Llanite before..

Did a little Googling and found a couple of examples in sphere form that were close to mine, but honestly, in comparison this really is more beautiful than other examples.

Although hard to get a good pic,  I am unsure if some of what I see is quartz lacking the blue coloration, or pockets of chalcedony. 

Maybe I am just beating a dead Llano Texas horse over this.. I am betting Bob is right about it being Llanite.

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Stacy
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« Reply #4 on: November 14, 2018, 02:00:17 pm »

Pretty! The blue inside the quarts is beautiful.
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SSA
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« Reply #5 on: November 14, 2018, 02:38:39 pm »

Pretty cool, all the slabs/rough I have are more of a brownish red matrix around the blue.  I'm betting you will get a better price for yours than mine
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Robert
Taogem
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« Reply #6 on: November 14, 2018, 09:48:53 pm »

Here is something about the brown.

Phenocysts in llanite can show geologists the time it took the crystals in llanite to form and how deep underground the crystals formed.

Rocks with relatively large phenocrysts were formed deeper underground under many layers of sediment. This is because the crystals had more time to develop as the magma was rising. Phenocrysts that were formed under many layers of sediment are usually easily visible.

Rocks with very small phenocrysts were formed near the surface. As opposed to large phenocrysts, these crystals had little time to form. When this magma cooled, the crystals were significantly smaller. This size of phenocryst is generally very hard to see or sometimes nearly invisible.

So the piece I cut this cab from was formed near the surface.

So my piece formed near the surface..  Although not exactly like mine, when Googling Llanite there are examples that lack the brown.



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Crystal
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« Reply #7 on: November 15, 2018, 01:47:30 am »

Beautiful cabochon Taogem!
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southerly
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« Reply #8 on: November 15, 2018, 02:44:15 am »

You could make a nice snuff bottle out of that stuff George.
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Taogem
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« Reply #9 on: November 15, 2018, 04:32:23 am »

You could make a nice snuff bottle out of that stuff George.


Indeed !  chuckle
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Debbie K
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« Reply #10 on: November 21, 2018, 10:05:48 pm »

Odd color; never seen it before in Llanite, and I've seen a lot of Llanite. I have it in light brown to dark brown; the dark is considered better material as it's harder and takes a better polish, hence less orange peel.
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