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Roger Warin
Joined: 23 Jan 2013
Posts: 1232
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 Posted: Feb 20, 2016 01:25 Post subject: Re: Photos of epitaxy - (16) |
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Hi,
Two other SEM pics of epitaxy of hematite on rutile, from Niveligsberg (Eifel).
Take a look at the general site of our club.
https://www.agab.be
Roger.
| Mineral: | Epitaxy of hematite on rutile |
| Locality: | | Niveligsberg Quarry, Niveligsberg Mountain, Kelberg, Eifel, Rhineland-Palatinate/Rheinland-Pfalz, Germany |  |
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32272 Time(s) |
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| Mineral: | Epitaxy of hematite on rutile |
| Locality: | | Niveligsberg Quarry, Niveligsberg Mountain, Kelberg, Eifel, Rhineland-Palatinate/Rheinland-Pfalz, Germany | |
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32285 Time(s) |
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Roger Warin
Joined: 23 Jan 2013
Posts: 1232
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| Posted: Feb 20, 2016 08:10 Post subject: Re: Photos of epitaxy - (16) |
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Hi,
Another classic epitaxial growth of rutile on hematite.
Roger.
| Mineral: | Epitaxy of rutile on hematite |
| Locality: | | Jerg Drecht, Cavradi, Curnera Valley, Tujetsch (Tavetsch), Vorderrhein Valley, Grischun (Grisons; Graubünden), Switzerland | |
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| Dimensions: | 2 cm |
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| Viewed: |
32245 Time(s) |
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Jesse Fisher
Joined: 18 Mar 2009
Posts: 639
Location: San Francisco
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| Posted: Nov 02, 2017 00:15 Post subject: Re: Photos of epitaxy - (16) |
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Epitaxial albite on microcline
| Mineral: | Albite, Microcline |
| Locality: | | Organ Mountains, Organ District, Doña Ana County, New Mexico, USA | |
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| Dimensions: | 14x8x3 cm overall size |
| Description: |
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| Viewed: |
29598 Time(s) |
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Pete Richards
Site Admin
Joined: 29 Dec 2008
Posts: 843
Location: Northeast Ohio
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| Posted: Nov 02, 2017 09:00 Post subject: Re: Photos of epitaxy - (16) |
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More epitaxy...
| Mineral: | Tainiolite epitactic on Arfvedsonite |
| Locality: | | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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| Dimensions: | Field of view 3.5 mm |
| Description: |
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| Viewed: |
29577 Time(s) |
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Jesse Fisher
Joined: 18 Mar 2009
Posts: 639
Location: San Francisco
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| Posted: May 28, 2018 12:48 Post subject: Re: Photos of epitaxy - (16) |
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Is it, or isn't it? I thought it quite interesting, at any rate. If not, what does one call it?
| Mineral: | Fluorite, Galena, Quartz |
| Locality: | | Nikolaevski Mine, Dalnegorsk, Dalnegorsk Urban District, Primorsky Krai, Far-Eastern Region, Russia | |
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| Description: |
| Second generation cube-octahedral fluorite crystals grown on the points of first generation octahedron. |
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28306 Time(s) |
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Pete Richards
Site Admin
Joined: 29 Dec 2008
Posts: 843
Location: Northeast Ohio
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| Posted: May 28, 2018 13:10 Post subject: Re: Photos of epitaxy - (16) |
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The second generation crystals appear to have cube faces in their middles, where they should be if this generation is oriented parallel to the previous one. This could be referred to as "autoepitaxy" or "homoepitaxy" (they mean the same thing), or less technically as an oriented overgrowth or simply an overgrowth.
Octahedral fluorite seems to be prone to overgrowths on the corners. I know of examples from at least three other localities.
_________________
Collecting and studying crystals with interesting habits, twinning, and epitaxy |
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Bob Morgan
Joined: 18 Jan 2018
Posts: 251
Location: Savannah, Georgia
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| Posted: May 28, 2018 18:36 Post subject: Re: Photos of epitaxy - (16) |
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| The other faces on the second growth are dodecahedral. These are cube-dodecahedral crystals on the octahedron tips. A lovely specimen. Several years ago I got a specimen from there with simple cubes on the tips.
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Bob Morgan
Joined: 18 Jan 2018
Posts: 251
Location: Savannah, Georgia
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| Posted: May 28, 2018 21:36 Post subject: Re: Photos of epitaxy - (16) |
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I've collected for epitaxy, and here are a few, beginning with another albite on microcline from New Mexico. This one has albite crystals above in different orientation from those below. That is because they are on two sides of an underlying Carlsbad twin.
| Mineral: | Albite on Microcline |
| Locality: | | Organ Mountains, Organ District, Doña Ana County, New Mexico, USA | |
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| Dimensions: | 11.5 Centermeters |
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| Viewed: |
28166 Time(s) |
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| Mineral: | Albite on Microcline |
| Locality: | | Organ Mountains, Organ District, Doña Ana County, New Mexico, USA | |
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| Dimensions: | 11.5 Centermeters |
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| Viewed: |
28131 Time(s) |
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Bob Morgan
Joined: 18 Jan 2018
Posts: 251
Location: Savannah, Georgia
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| Posted: May 28, 2018 21:58 Post subject: Re: Photos of epitaxy - (16) |
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Another albite epitactic on microcline
| Mineral: | Albite epitactic on Microcline |
| Locality: | | Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada | |
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| Dimensions: | 5.5 cm x5.5 cm |
| Description: |
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| Viewed: |
28154 Time(s) |
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Bob Morgan
Joined: 18 Jan 2018
Posts: 251
Location: Savannah, Georgia
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| Posted: May 28, 2018 22:05 Post subject: Re: Photos of epitaxy - (16) |
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Epitaxy of tetrahedrite on pyrite
| Mineral: | Tetrahedrite on Pyrite |
| Locality: | | Huanzala Mine, Huallanca District, Dos de Mayo Province, Huánuco Department, Peru | |
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| Dimensions: | 5x3 cm |
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| Viewed: |
28113 Time(s) |
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| Mineral: | Sphalerite on Chalcopyrite |
| Locality: | | Huanzala Mine, Huallanca District, Dos de Mayo Province, Huánuco Department, Peru | |
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| Dimensions: | 3x2,5 cm |
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| Viewed: |
28169 Time(s) |
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Johan Kjellman
Joined: 10 Jan 2014
Posts: 19
Location: Uppsala
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| Posted: Oct 20, 2021 14:47 Post subject: Columbite on Samarskite |
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Sample 1998-8184 from Museum für Naturkunde in Berlin, type sample from Gustav Rose.
| Mineral: | Samarskite-(Y), Columbite-(Fe) |
| Locality: | | Ilmenskie Mountains, Chelyabinsk Oblast, Ural Federal District, Russia | |
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| Dimensions: | 19 mm |
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| Viewed: |
16465 Time(s) |
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