Tagged With: Minerals

Calcite Crystal

Calcite Crystal

Calcite Crystal

In the process of going through things at mom’s, I spent some time looking through a bunch of rock. I’m not sure what it is about rocks and our family, but it seems we all have a rock collection of some description. Mom also had some rocks and minerals that had been her fathers, including this large calcite crystal. A large section of the crystal is opaque but the left side as shown here is mostly transparent. Calcite crystals have an interesting optical property called birefringence, that is, they have a double refraction, causing two images of any items viewed through the crystal. As you can see here, the word Library (on a Modern Library copy of The Aeneid) is duplicated when viewed through the crystal.

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Malachite and Azurite

Malachite and Azurite

Malachite and Azurite

I think I mentioned before that my great grandfather was a miner in Nevada in the late 19th century. He mined two forms of copper ore, green malachite and blue azurite, copper carbonates with formulas Cu2CO3(OH)2 and Cu3(CO3)2(OH)2 respectively. For some reason, our family collects rocks. These were gathered on the mountain where my great grandfather lived and where my grandfather and his two siblings were born and raised. We have recently thrown away a lot of rocks that were in my mom’s basement but we kept a few that were particularly nice. Cathy put some in this bowl and they are outside our front door, where the bowl has filled with rain water, which I think makes it especially nice.

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Azurite and Malachite

Azurite and Malachite

Azurite and Malachite

The other day I posted a photo of a small souvenir from Republic, Michigan, where some of Cathy’s ancestors lived and at least one was involved in iron mining before moving to Alaska to mine gold. Well, my family has a little mining history, as well. My great grandfather came from England with his parents and at least some of his siblings. They lived in Canada for a while and he was in the military there during the United States Civil War. In the early 1970s he moved to Nevada where he mined for copper and silver. This is a piece of copper ore including both blue azurite (Cu3(CO3)2(OH)2) and green malachite (Cu2CO3(OH)2). It’s a small piece found in the area he lived and worked and I think it’s sort of pretty. This piece is wet, which contributes to its shininess.

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