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Calcite crystal habit

Index -> FOR BEGINNERS: What is it? Where is it from?

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Jaime_Cerdeira

Joined: 09 Feb 2025
Posts: 6
Location: Lisbon

Posted: 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:

3085 Time(s)

IMG_7388.JPG

Mineral:

Calcite

Locality:

Serra da Arrábida, Setúbal District, Área Metropolitana de Lisboa Region, Portugal

Description:

Viewed:

3085 Time(s)

IMG_7381.JPG

Mineral:

Calcite

Locality:

Serra da Arrábida, Setúbal District, Área Metropolitana de Lisboa Region, Portugal

Description:

Viewed:

3097 Time(s)

Pete Richards
Site Admin

Joined: 29 Dec 2008
Posts: 846
Location: Northeast Ohio

Posted: Feb 23, 2025 16:09 Post subject: Re: Calcite crystal habit

These crystals are rhombohedra. _________________ Collecting and studying crystals with interesting habits, twinning, and epitaxy

Jaime_Cerdeira

Joined: 09 Feb 2025
Posts: 6
Location: Lisbon

Posted: Feb 23, 2025 16:14 Post subject: Re: Calcite crystal habit

Hi Pete, Thanks a lot!

Bob Morgan

Joined: 18 Jan 2018
Posts: 254
Location: Savannah, Georgia

Posted: 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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