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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.
Calcite crystal habit
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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Jaime_Cerdeira




Joined: 09 Feb 2025
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PostPosted: Feb 23, 2025 14:20    Post subject: Calcite crystal habit  
Dear all,

Can you please help me to identify these crystal habits?

Many thanks!

1 (3).JPG
 Mineral: Calcite
 Locality:
Serra da Arrábida, Setúbal District, Área Metropolitana de Lisboa Region, Portugal
 Description:
 Viewed:  711 Time(s)

1 (3).JPG
IMG_7388.JPG
 Mineral: Calcite
 Locality:
Serra da Arrábida, Setúbal District, Área Metropolitana de Lisboa Region, Portugal
 Description:
 Viewed:  711 Time(s)

IMG_7388.JPG
IMG_7381.JPG
 Mineral: Calcite
 Locality:
Serra da Arrábida, Setúbal District, Área Metropolitana de Lisboa Region, Portugal
 Description:
 Viewed:  710 Time(s)

IMG_7381.JPG
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Pete Richards
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Joined: 29 Dec 2008
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PostPosted: Feb 23, 2025 16:09    Post subject: Re: Calcite crystal habit  
These crystals are rhombohedra.
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Collecting and studying crystals with interesting habits, twinning, and epitaxy
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Jaime_Cerdeira




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PostPosted: Feb 23, 2025 16:14    Post subject: Re: Calcite crystal habit  
Hi Pete,

Thanks a lot!
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Bob Morgan




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PostPosted: Feb 24, 2025 09:47    Post subject: Re: Calcite crystal habit  
They are the unit or cleave rhomb with Miller Index of [10-1,1}.
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