FMF - Friends of Minerals Forum, discussion and message board

[Brent Lockhart]

[Bob Harman]

Quartz crystals from many locations can be covered by any of a number of aesthetically pleasing other minerals. Here is an Indiana quartz geode with hematite on the quartz crystal surfaces. Self collected in Monroe County about 2006.

For completeness, this example was also added to the Indiana pages of the mineralogical trip thru the states of the USA.

[Les Presmyk]

I collected this one.

[Tobi]

[Bob Harman]

Rarely Indiana quartz might be found as well formed doubly terminated crystals. The largest found are about 1 cm. This example is unusual as several adjacent crystals are side by side.

[Enrique Llorens]

Quartz from Peru

[Michael Shaw]

This tiny little Quartz var. Herkimer diamond has always been one of my favorites because of the clarity and unusual morphology. I collected this one back in 1962.

[geofossile]

Quartz with Muscovite (variety fuchsite) from Itremo, Madagascar.

[Jordi Fabre]

[Bergur_E_Sigurdarson]

My favourite quartz, with paralell secondary growths.

Main crystal : H 85mm x W 27mm x D 25mm

Bought in the village of Muzo from local vendor.

(Can anyone tell me what this sort of growth would be called?)

(After looking for variations of quartz growths, the closest I could find was called "cactus", but those seemed to grow outwards from the main original crystal, not paralell like in this specimen.
Also, after reading another topic here on the forum, where photos of epitaxy were posted.... would this be an auto-epitaxy ?
(according to Pete Richards definition, if I understood correctly... but not according to John S. White (a discussion I enjoyed))) :-)

[vic rzonca]

This is from the book by Harold L. Dibble, Quartz." Cathedral Quartz. One of the most common of these types is known as Cathedral quartz. These are crystals with the axes of the secondary crystals parallel to those of the main crystal. These clusters vaguely resemble smaller spires or buttresses around the main spire of a cathedral." More of a descriptive term than a scientific one. I guess everything has to be called something.

[Tobi]

Definitely two of my favourites:

[Heimo Hellwig]

Quartz from Goboboseb. Saw this specimen when visiting an elderly gentleman in the retirement village. He allowed me to photograph and post it on the Forum. Nicest local Quartz I have come across.

[Bob Harman]

Groups of tiny water clear quartz crystals showing free form growths adjacent to a calcite crystal. Self collected about 10 years ago.

[Tobi]