[Geysers] Biscuit Basin names

[Pat Snyder]

Thanks a bunch!
I have one of those rock and mineral books but it doesn't give a lot  
of background on how the minerals form.

My vote is not for any of my suggestions, though. It's for Kitt's  
Salt & Pepper Geyser. I love that name, very cute and memorable.
Pat S.


On Jul 18, 2006, at 1:38 AM, geyser1 at netzero.net wrote:

> OK, I'll assume the role of GOSA mineralogist and answer Pat's  
> question.  Olivine is not really greenish black, but can be  
> brownish-green when containing significant iron.  Typically it is   
> yellowish-green.  Gem quality olivine is known in the gem trade as  
> peridot.
>
> Strictly speaking, olivine and garnet are actually names of mineral  
> groups.  The most common minerals of the olivine group are  
> forsterite (magnesium end member) and fayalite (iron end member),  
> which form a complete solid solution series between the end members.
>
> Some of the more well known minerals of the garnet group include  
> almandine, pyrope, grossular, andradite, and spessartine.  Of  
> these, andradite commonly occurs in darker shades of brown and  
> black.  The others are commonly used in the gem trade and tend to  
> be more colorful (reds, oranges, pinks).
>
> -- Will
>
>
> ************
>
> Some really nice black or silver minerals are
> Galena
> Hornblende
> Graphite
> Hematite
> Stephanite
>
> Also, garnets can be many colors--maybe Garnet Geyser? And Almandine,
> they are dark brown to black minerals.
>
> Also, Black Pearl
> Abalone
> Mother of Pearl
>
> And olivine can be greenish black, right?
>
> I like Graphite Geyser or Black Pearl Geyser.
>
> Just some ideas.
> Pat Snyder
>
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