Heulandite

heulandite_alpine_texas_mr_va2840_2391_2592hfc

This sample is from Alpine Texas and is shown at 3.3X and a FOV 7.14mm.

Heulandite was designated a series of minerals in 1997 by the International Mineralogical Association.  "Heulandite-Ca, the most common of these, is a(n) hydrous calcium and aluminium silicate, (Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O.", says Wikipedia.

Mindat comments that: There is some difficulty in distinguishing Heulandite from Clinoptilolite which we discussed recently.  I take that to mean that they are close in their properties.

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Pink Angel's Trumpet

Pink Angel's Trumpet

I try to keep these flower pictures seasonal.  I photographed this Brugmansia arborea at Kingwood Greenhouse in November of 2007.

This capture was made difficult by the downward angle at which it grows.  When I saw "arborea" in its scientific name I wondered about it.  I just read at Wikipedia that it is a small tree which can grow up to 21'.

In the 10 years since the capture, I seem to have forgotten that it is strongly fragrant. 

I did remember the bloom to be large.

Wikipedia reports that the plant is native to the Andes mountains in Southern Columbia.

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Canon Rebel XSI

Canon Rebel XSI

I bought this camera about a year ago to use in micro photography.  I read that 12 megapixel

was the highest resolution camera one should use in micro photography.  To my knowledge, no one makes DSLRs in 12 megapixels.  This is a circa 2008 camera.  I prefer, however; using my subpro 7D and have not decided that it is worse than the XSI for this purpose.

I saw images on
mindat.org showing what happens when too high resolution camera is used. 
Ronald J. Pellar at mindat has a good essay on this subject.  I can't understand the math he
presents and can't make the calculations required.  You might want to check out Ron's essay. 
I have expressed my confusion in a reply to him.

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Clinoptiliolite

Clinoptiliolite

This sample comes from Los Angeles County, California and is displayed at 11.75X, the field of view being 2mm.

According to Wikipedia its primary existence world wide is located around the Aegean Sea.

Clinoptiliolite

I had trouble finding this at mindat.org.  I couldn't find it by searching Wickpedia.  I searched using Google on the web and found it.  It was first described in 1969, Owl Canyon, San Bernardino County, California.  Wikipedia  

Clinoptiliolite

Industrially, it is used as a urea sensor, a fertilizer and as a deodorizer.  Formula:

(repeating unit)	(Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12H2O

Wickipedia




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