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Search found 44 matches |
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RayStraw Replies: 2 Views: 7052 |
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The stain appears to be green.
If so, this may be a pseudomorph to azurite. Most of these pseudos start at the center of the area of attachment to the matrix. The replacing malachite is almo ... |
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RayStraw Replies: 9 Views: 9710 |
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Thanks for all the insight.
I trying to understand how the pseudomorph grows with the azurite crystal. Perhaps the first step is dissolution of the azurite near the pseudorph with acid. Then th ... |
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RayStraw Replies: 9 Views: 9710 |
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The attached picture shows botryoidal malachite nucleated on the side of a 7cm azurite crystal from the Tsumeb mine, Otavi Highlands, Namibia (Ray Straw specimen, Jeff Scovil photograph).
In a recent ... |
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RayStraw Replies: 0 Views: 12056 |
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Chemical alteration of dark blue azurite crystals to bright green Malachite that exhibits the preservation of the original azurite surfaces—thus a pseudomorph.
In a recent paper (Rocks and Mineral ... |
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RayStraw Replies: 9 Views: 7013 |
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Thanks everyon for your responses. They were very helpful.
Ray Straw |
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RayStraw Replies: 9 Views: 7013 |
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I am interested in examples of cleavage in azurite crystals.
Does anyone have any pictures of these? |
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RayStraw Replies: 4 Views: 6363 |
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Thank you for the quick reply.
I’ll start checking out the material and advise how it goes. Ray I |
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RayStraw Replies: 4 Views: 6363 |
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I understand that these sulfides that are near the surface can be oxidized and then the products transported below the surface to form enriched deposits.
I am looking for chemical equations that desc ... |
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RayStraw Replies: 28 Views: 36986 |
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This is very interesting.
Please advise the locality. Ray |
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RayStraw Replies: 28 Views: 36986 |
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Hi all
You may find some answers and a general overview about the chemical aspects of mineral replacement reactions in the paper by A. Putnis. Mineralogical Magazine, October 2002, Vol. 66(5), pp. ... |
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RayStraw Replies: 28 Views: 36986 |
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I have a 11cm high broken azurite which shows internal growth of botryoidal malachite.
The rough chemistry requires 2 portions of solid azurite and one portion of liquid water to yield three portio ... |
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RayStraw Replies: 3 Views: 14108 |
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I recently purchased an azurite specimen partially replaced by malachite. The large crystal has malachite on the termination and one of the small crystals is broken showing botyroidal malachite on th ... | |
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RayStraw Replies: 14 Views: 8531 |
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Two years ago I saw a demonstration of in camera focus stacking at the Rochester Mineral Symposium.
I bought the reasonable camera Olympus TG-4 and am pleased with the results. I plan to use the ... |
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RayStraw Replies: 5 Views: 14473 |
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Thank you.
I bought and downloaded the paper. Ray |
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RayStraw Replies: 14 Views: 28596 |
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This specimen from Roger Warin is just what I need for my azurite to malachite pseudomorph research (Malachite-psm-aurite_R.jpg):
Azurite crystal with chipped termination and malachite pseudomo ... |
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RayStraw Replies: 5 Views: 14473 |
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Someone claimed that all malachite is twinned.
Does anyone know of any discussion or papers to this effect? Best, Ray |
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RayStraw Replies: 14 Views: 28596 |
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Roger:
This Tsumeb pseudomorph appears to be about 3cm maximum. Is that correct? Is it still in your collection? Best, Ray Straw |
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RayStraw Replies: 14 Views: 28596 |
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Thanks everyone for your interpretations of azurite to malachite pseudomorphs.
All the information will be distilled and included in my paper. Best, Ray Straw |
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RayStraw Replies: 14 Views: 28596 |
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Roger:
The partial pseudomorph would be ideal for my purposes which will involve cutting sections of the crystal. Please advise specimen dimensions. Thank you, Ray rsplinters(@)gmail do ... |
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RayStraw Replies: 14 Views: 28596 |
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I am still working on my paper which attempts to explain how malachite replaces azurite to form a pseudomorph where the azurite shape and faces are present but only malachite remains.
1. What I ne ... |
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