Calcite

  
Origin: Malmberget mine, Sweden
Sample size: 5 x 3 x 3 cm, doubly terminated crystal 2.3 x 1 cm
 
  
Calcite crystals with oil inclusions
Origin: Rensselaer, Indiana, USA
Sample size: 4 x 2 x 2 cm
 
  
Origin: Irai, Rio Grande do Sol, Brazil
Sample size: crystals to 2.5 cm
 
  
Origin: O'Neal's quarry, Plymouth, Illinois, USA
Sample size: 10 x 6 x 4 cm
 
  
Origin: Minerva #1 mine, Hardin Co., Illinois, USA
Sample size: 8 x 5 x 4 cm, crystals to 2 cm
 
    
Calcite exhibiting some sort of scepter growth
Origin: Dalnegorsk, Russia
Sample size: largest crystal 4 cm
 
Origin: Egremont, Cumbria, England
Sample size: 5 x 4 x 3 cm, nailhead crystals to 2 cm
 
  
Cobaltian calcite
Origin: Tsumeb mine, Tsumeb, Namibia
Sample size: 6 x 4.5 cm
 
    
Calcite with chalcopyrite, pyrite and pyrite pseudomorph after pyrrhotite
Origin: Naica mine, San Luis Potosi, Bolivia
Sample size: 10 x 8 x 3 cm
 
     
Origin: Reynolds Co., Missouri, USA
Sample size: 10 x 7 x 7 cm
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

  
Calcite twin
Origin: Mont-sur-Marchienne, Hainaut, Belgium
Sample size: 7 x 6 x 5.5 cm
 
  
Calcite twin
Origin: Elmwood Mine, Carthage, Tennessee, U.S.A.
Sample size: 9.4 x 4.7 x 4 cm
 
  
Manganoan calcite
Origin: Idarado Mine, San Miguel Co, Colorado, U.S.A.
Sample size: 9.5 x 7 x 5.5 cm
 
     
Origin: Broken Hill, New South Wales, Australia
Sample size: 6 x 4 x 3 cm
 

Photo courtesy of: 

Rob Lavinsky

The Arkenstone

 

  
This specimen consists of a few twinned crystals of calcite with twinning on 001 and 081. There are also small crystals of stilbite present as well.
  
This specimen consists of a group of complex, twinned calcite crystals with several silky white crystals to stilbite to 1.3 cm in length.
  
This specimen consists of two twinned crystals of calcite twinned on 081 and then twinned again on 001.
Origin: Sambava, Antsirana, Madagascar, Africa
Sample size: 4 x 2.5 x 2.4 cm (top/2nd row), 5.6 x 4.2 x 2.8 cm (3rd/4th row), 3.4 x 3.1 x 2.9 cm (5th/bottom row)
 
 

Photo courtesy of: 

John Veevaert, Trinity Mineral Co

Trinityminerals.com

 

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