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Some useful information in these responses, thanks everyone.

To clarify a couple of points [1] as someone who has worked on this a bit, it is very possible to have a population of different crystal ...

I am looking for information about the conditions under which pyrite forms pyritohedral or icosahedral single crystals. The first is when {210} facets are favored; the second is when both {210} and {1 ...

If grown by, for instance, vapor deposition then every fcc metal can produce fivelings and also icosahedra -- not as naturally formed minerals though. From Goldschmidt's atlas I found naturally occuri ...

I am looking for nice examples of fivelings, either images or references earlier than 1960 (in particular any in the 1800's). Any links very much appreciated.

Author	Message
Topic: Conditions where pyrite/pyritohedra are formed
LDMarks Replies: 16 Views: 12351	Forum: Minerals and Mineralogy Posted: Oct 06, 2021 22:00 Subject: Re: Conditions where pyrite/pyritohedra are formed
LDMarks Replies: 16 Views: 12351	Some useful information in these responses, thanks everyone. To clarify a couple of points [1] as someone who has worked on this a bit, it is very possible to have a population of different crystal ...
Topic: Conditions where pyrite/pyritohedra are formed
LDMarks Replies: 16 Views: 12351	Forum: Minerals and Mineralogy Posted: Sep 30, 2021 14:26 Subject: Conditions where pyrite/pyritohedra are formed
LDMarks Replies: 16 Views: 12351	I am looking for information about the conditions under which pyrite forms pyritohedral or icosahedral single crystals. The first is when {210} facets are favored; the second is when both {210} and {1 ...
Topic: About cyclic twinning - (5)
LDMarks Replies: 157 Views: 280022	Forum: Featured Columns of FMF Posted: Aug 06, 2021 13:56 Subject: Re: About cyclic twinning - (5)
LDMarks Replies: 157 Views: 280022	If grown by, for instance, vapor deposition then every fcc metal can produce fivelings and also icosahedra -- not as naturally formed minerals though. From Goldschmidt's atlas I found naturally occuri ...
Topic: About cyclic twinning - (5)
LDMarks Replies: 157 Views: 280022	Forum: Featured Columns of FMF Posted: Aug 05, 2021 11:10 Subject: Re: About cyclic twinning - (5)
LDMarks Replies: 157 Views: 280022	I am looking for nice examples of fivelings, either images or references earlier than 1960 (in particular any in the 1800's). Any links very much appreciated.