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A general guide for using the Forum with some rules and tips
The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
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| Search found 7 matches |
| Author | Message |
|---|---|
 Topic: Phillipsite - Marburg twin |
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| Brian Jackson Replies: 9 Views: 15912 |
 Forum: Minerals and Mineralogy Posted: Jan 26, 2012 09:27 Subject: Re: Phillipsite - Marburg twin |
| Dear All
Many thanks for your thoughts. There is indeed a strong temptation to think the the interpenetration angles have been filled in but for the love of me I can't think of any mechanism that wou ... |
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| Topic: Phillipsite - Marburg twin |
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| Brian Jackson Replies: 9 Views: 15912 |
Forum: Minerals and Mineralogy Posted: Jan 24, 2012 07:29 Subject: Phillipsite - Marburg twin |
| On the Isle of Lewis there is a very interesting late Tertiary dyke that contains acid rcok xenoliths, ultra basic xenoliths, megacrystals of augite, biotite, sapphire, apatite and sanidine. Tiny cav ... | |
| Topic: Crystal defects |
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| Brian Jackson Replies: 6 Views: 11142 |
Forum: Off-Topic and Introductions Posted: Mar 18, 2011 16:23 Subject: Re: Crystal defects |
| Hi Folks
Many thanks for taking the time to reply. I believe you are right in that I'll have to make it myself even though some, like me, can recall seeing such a piece of kit before. Ah well anoth ... |
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| Topic: Crystal defects |
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| Brian Jackson Replies: 6 Views: 11142 |
Forum: Off-Topic and Introductions Posted: Mar 17, 2011 12:05 Subject: Re: Crystal defects |
| I don't actually care much what the material is made of it's just that the one I saw before had tiny 1mm or there abouts ball-bearings and worked very well. | |
| Topic: Crystal defects |
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| Brian Jackson Replies: 6 Views: 11142 |
Forum: Off-Topic and Introductions Posted: Mar 17, 2011 08:52 Subject: Crystal defects |
| Hi. Does anyone know where I can get hold of a piece of kit that comprises small ball-bearings that allow one to demonstrate crystal dislocation defects. I saw one some years ago but sadly memory fa ... | |
| Topic: Can someone clarify what 'adularia' is? - What is meant by 'variety'? |
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| Brian Jackson Replies: 20 Views: 54965 |
Forum: Minerals and Mineralogy Posted: Nov 13, 2010 08:05 Subject: Re: Can someone clarify what 'adularia' is? - What is meant by 'variety'? |
| Hi
You may be interested in this twin crystal of adularia from the Alps |
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| Topic: Polarized Apatite fluorescence |
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| Brian Jackson Replies: 9 Views: 19707 |
Forum: Minerals and Mineralogy Posted: Nov 13, 2010 06:15 Subject: Re: Polarized Apatite fluorescence |
| Hi. Elise notified these posts to me. My recollection was that the apatite from Slyudyanka showed no fluorescence. I checked this last night (SW-MW-LW UV) and indeed there was no fluorescence.
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