We use cookies to show content based on your preferences. If you continue to browse you accept their use and installation. More information. >


FMF - Friends of Minerals Forum, discussion and message board
The place to share your mineralogical experiences


Spanish message board





Newest topics and users posts
16 Jul-17:31:41 The mizunaka collection - chalcoalumite (Am Mizunaka)
16 Jul-12:44:28 Architectural spinel from vietnam / #mvm (minerals - virtual museum) collection (Jordi Fabre)
16 Jul-12:18:23 New book: minerals of britain and ireland 2009-2024 - a review (Jordi Fabre)
16 Jul-09:38:43 Re: collection of michael shaw (Michael Shaw)
15 Jul-13:05:10 Sphalerite with calcite from Áliva, spain / #mvm (minerals - virtual museum) collection (Jordi Fabre)
15 Jul-11:32:34 Goesdorf mine (luxembourg) antimony (Roger Warin)
14 Jul-18:03:59 Malachite after azurite on goethite (Silvia)
14 Jul-16:43:05 The mizunaka collection - quartz (Am Mizunaka)
14 Jul-09:34:45 Re: collection of michael shaw (Michael Shaw)
13 Jul-12:19:45 Lazurite (lapis lazuli) from afghanistan / #mvm (minerals - virtual museum) collection (Jordi Fabre)
12 Jul-23:04:14 Re: collection of volkmar stingl (Volkmar Stingl)
12 Jul-09:00:56 Re: the mim museum in beirut, lebanon (Mim Museum)
12 Jul-06:59:21 Re: collection from dany mabillard (Dany Mabillard)
12 Jul-00:49:24 Re: are there pyrite balls found in verzino? (Herwig)
12 Jul-00:25:14 Re: are there pyrite balls found in verzino? (Roger Warin)
12 Jul-00:08:38 Re: are there pyrite balls found in verzino? (Roger Warin)
11 Jul-17:36:07 The mizunaka collection - fluorite (Am Mizunaka)
11 Jul-14:14:25 Re: slice schalenblende (Mathias)
11 Jul-14:08:21 Re: czech rockhounding adventures – agates & amethysts (Stoner)
11 Jul-08:12:55 Czech rockhounding adventures – agates & amethysts (Stoner)
11 Jul-08:03:52 Re: are there pyrite balls found in verzino? (James Catmur)
11 Jul-02:33:28 Re: collection of michael shaw (Michael Shaw)
11 Jul-00:24:28 Re: collection of volkmar stingl (Volkmar Stingl)
10 Jul-13:46:07 Re: are there pyrite balls found in verzino? (Dany Mabillard)
10 Jul-13:45:53 Veszelyite from sanguozhuang, china / #mvm (minerals - virtual museum) collection (Jordi Fabre)

For lists of newest topics and postings click here


RSS RSS

View unanswered posts

Why and how to register

Index Index FAQFAQ RegisterRegister  Log inLog in
 {Forgotten your password?}Forgotten your password?  

Like
122731


The time now is Jul 18, 2025 11:51

Access to the FMF Gallery
Search for an image   
Yesterday's most viewed photos
Yesterday's most
viewed images

 Last month's most viewed photos
Last month's
favorite topic
Search for a textSearch for a text   
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.
Why quartz parallel association is not a twin?
  
  Index -> Minerals and Mineralogy
Like

View previous topic :: View next topic  
Author Message

marco campos-venuti




Joined: 09 Apr 2014
Posts: 234
Location: Sevilla

Access to the FMF Gallery title=

View user's profile

Send private message
PostPosted: Dec 20, 2014 12:16    Post subject: Why quartz parallel association is not a twin?  
It's a stupid question or a fundamental topic?

1307 (Medium).JPG
 Mineral: Quartz
 Locality:
Madagascar
 Dimensions: 9.5 cm
 Description:
 Viewed:  8975 Time(s)

1307 (Medium).JPG
2133 (Medium).JPG
 Mineral: Quartz with amphibole inclusions
 Locality:
Madagascar
 Dimensions: 9 cm
 Description:
 Viewed:  9026 Time(s)

2133 (Medium).JPG
Back to top
Reply to topic Reply with quote
Like
   

Josele




Joined: 10 Apr 2012
Posts: 410
Location: Tarifa, Spain

Access to the FMF Gallery title=

View user's profile

Send private message
PostPosted: Dec 20, 2014 13:35    Post subject: Re: Why quartz parallel association is not a twin?  
Since quartz prisms are always twinned in any case would be a twin of twins!

But I think not, parallel growth crystals are not twins because they share the same crystal lattice, there is not a boundary between them and not necessarily the geometrical "contact plane" is a symmetry plane of the set.

Can see twinning definition here: https://www.crystallography.fr/mathcryst/twins.htm
_________________
Josele
Back to top
Reply to topic Reply with quote
Like
   

marco campos-venuti




Joined: 09 Apr 2014
Posts: 234
Location: Sevilla

Access to the FMF Gallery title=

View user's profile

Send private message
PostPosted: Dec 20, 2014 14:02    Post subject: Re: Why quartz parallel association is not a twin?  
Ok, it was a stupid question!
Back to top
Reply to topic Reply with quote
Like
   

Mark Ost




Joined: 18 Mar 2013
Posts: 516
Location: Virginia Beach

Access to the FMF Gallery title=

View user's profile

Send private message
PostPosted: Dec 20, 2014 18:25    Post subject: Re: Why quartz parallel association is not a twin?  
I don't think the question was stupid. God knows all the rules are impossible to remember and as you know twin laws are not always obvious.
Back to top
Reply to topic Reply with quote
Like
   
Display posts from previous:   
   Index -> Minerals and Mineralogy   All times are GMT - 5 Hours
Page 1 of 1
    

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


All pictures, text, design © Forum FMF 2006-2025


Powered by FMF