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Search found 111 matches |
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Duncan Miller Replies: 2 Views: 4912 |
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Hi Nirvash
You could join the Natal Gem & Mineral Society to learn more about the local rocks and minerals, including those around Josini. Contact: Renee Hadfield natalmineralandgemsociety @ gm ... |
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Duncan Miller Replies: 6 Views: 7632 |
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I don't know if the colour and pleochroism are diagnostic, but your images certainly "look" like those in MacKenzie & Guilford, including one with an acute termination. What else might t ... | |
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Duncan Miller Replies: 6 Views: 7632 |
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Daniel - According to MacKenzie & Guilford (1980) 'Atlas of rock-forming minerals in thin section', aenigmatite may appear opaque but the deep brown colour is pleochroic,. So perhaps you can incre ... | |
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Duncan Miller Replies: 5 Views: 17875 |
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There is an error on page 59 of Stories in Stone. The rock described as rhyolite, in the text and caption to the photograph, actually is a feldspar-rich syenite.
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Duncan Miller Replies: 1 Views: 15357 |
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This type of 'magazine’ display that we often use in this section does not allow photos to be enlarged by clicking the mouse on them. The solution to enlarge the screen is to use the keys: Ctrl + mous ... | |
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Duncan Miller Replies: 1 Views: 15357 |
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Blue chalcedony pseudomorphs from Ysterputs, southern Namibia
By Jo Wicht and Duncan Miller Ysterputs farm in southern Namibia is well known for its blue lace agate, a variety of banded chalcedony ... |
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Duncan Miller Replies: 6 Views: 6156 |
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The folks at the Lapidary Corner: Colored Stones on the GemologyOnline forum may be able to point you in the right direction. Just search for GemologyOnline(dot)com and navigate from there. | |
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Duncan Miller Replies: 5 Views: 17875 |
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Dear Jordi,
I would like to thank you, and Carlos Rey and Antonio López Cabello, for the work you have put into publishing Stories in Stone on both the Spanish and English FMF message boards. It is ... |
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Duncan Miller Replies: 5 Views: 17875 |
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This type of 'magazine’ display that we often use in this section does not allow photos to be enlarged by clicking the mouse on them. The solution to enlarge the screen is to use the keys: Ctrl + mous ... | |
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Duncan Miller Replies: 5 Views: 17875 |
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At the end of March 2020 South Africa went into an extended ‘hard lockdown’ to try to slow the spread of the COVID-19 virus. This obliged everyone to stay at home, except to buy essential goods or rec ... | |
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Duncan Miller Replies: 10 Views: 12456 |
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I think the rough texture is just natural etching of exposed surfaces, with the smoother faces protected by whatever mineral the crystal was embedded in originally. | |
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Duncan Miller Replies: 13 Views: 23694 |
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This fairly recent paper isn't about garnets, but it has a potentially useful list of references and gives one some idea of the complexity of research in trying to understand crystal habits. It should ... | |
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Duncan Miller Replies: 364 Views: 468071 |
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we publish all kinds of flowering plants (more, please)
This is for Jordi, who evidently likes exotic plants. Autumn In the south western Cape, South Africa is our spring, when plants sense the comin ... |
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Duncan Miller Replies: 30 Views: 63689 |
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Duncan, your pentax should have a manual white balance setting where you can adjust the temperature in kelvins. Try starting at 5-6k and adjust up or down as needed. Might save some time/frustration I ... | |
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Duncan Miller Replies: 30 Views: 63689 |
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This was my initial photographic set-up - wine box, tracing paper over cut-outs, Lumix point-and-shoot camera, sunlight outside. You may laugh, but with some computer tweaking the photographs were goo ... | |
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