Saturday, November 23, 2019

Pentagonite



Pentagonite
Ca(VO)Si4O10 · 4(H2O)

This is Pentagonite, emphasis on "tag."  It is collected for its rarity.  This sample comes from Wagholi Puna, India.  To my knowledge, this is one of only two locations in the World where it is found.  The other place, the "type location":  Owyhee Dam, Lake Owyhee State Park, Malheur Co., Oregon, USA. It was discovered in the fall of 1960. Mr. and Mrs. Leslie Perrigo of Fruitland, Idaho found a blue mineral partly coating a large rock in a new roadcut near Owyhee Dam, Malheur County, Oregon.  Nice find for a beautiful fall tree color walk!

Pentagonite
I came to me in the capsule and tray shown above.  I'll share the challengs to me in photographing it next time.

Wednesday, November 20, 2019

Photographing Elemental Silver III




Elemental Silver
How do I know this is Elemental Silver?  Don Smolley, a dealer at the Richland Lithic and Lapdary Show held in June each told me so.  I'm impressed that he would know because he tells me about the travels he makes while looking for samples.  I've never discovered his ID to be wrong.

As I write, it is 11:51AM on Saturday, 11-9-19.  The buckeyes play Maryland at 12:00PM on TV.  I must wait until 1:00PM to watch so that I can avoid watching all the commercials.  I normally eat my lunch at 11:00AM but I want to wait until 1:00PM to eat my lunch.  I have a bath at 2:00PM.  I can't seem to live without a schedule.  Oh, I forgot to mention that I'm listening to Pat Matheney Group's album "The Road to You."  It's jazz and my friend Jim told me about this group.

These samples are mounted on a black piece of Matte in an area about 1 inch square.  You can start to see the challenge, I am sure.  To the best of my knowledge, they don't make zoom lenses for photomicrogrophy.

Elemental Silver
 All these samples come from Bulldog Mtn., Creede Colorado.  This one looks like a tree or a leaf to me.  The FOV, field of view, here is 2.25mm.  My point is that it is a bit of challenge to decide the lens combination with which to photograph to obtain a frame filling image.  In photographing the samples on the card at the top I used five different lens combinations.

Elemental Silver

   I think you have seen this one.  FOV 2.25mm

Elemental Silver
I've discussed this one before in this series.  FOV 2.25mm.

Elemental Silver
The FOV of this one is 4.5mm.


Elemental Silver

FOV 2.25mm
 

Elemental Silver
FOV 1.5mm
 

Elemental Silver
FOV 0.73mm
 











                  


Elemental Silver














FOV 1.5mm









Elemental Silver
FOV 0.73mm