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Dendritic barite

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vegasjames no longer being taken for granite Member since June 2013 Posts: 9,565	Dendritic barite Feb 11, 2024 8:26:44 GMT -5 Fossilman, rockjunquie, and 3 more like this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by vegasjames on Feb 11, 2024 8:26:44 GMT -5

chris1956 driving up their electric bill Member since July 2022 Posts: 2,402	Dendritic barite Feb 11, 2024 19:08:45 GMT -5 vegasjames likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by chris1956 on Feb 11, 2024 19:08:45 GMT -5 Is this what I see online described as dendritic agate or opal? Looks like it would be great polished.

vegasjames
no longer being taken for granite

Member since June 2013
Posts: 9,565

Dendritic barite Feb 12, 2024 9:29:15 GMT -5 Fossilman, ThomasT, and 1 more like this

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Post by vegasjames on Feb 12, 2024 9:29:15 GMT -5

Feb 11, 2024 19:08:45 GMT -5 chris1956 said:

Is this what I see online described as dendritic agate or opal? Looks like it would be great polished.

Not the same thing. Opal is amorphous (lacking crystal structure) silicon dioxide and water mainly with some aluminum oxide and other impurities. So opal is actually a gel, not a true solid. As the opal's water content drops below 3%, the opal crystallizes in to some form of chalcedony (cryptocrystalline to microcrystalline quartz). These are common chalcedony, agate, jasper and chert/flint.

Barite on the other hand is barium sulfate, and so is completely unrelated. Barite literally means heavy stone, and it kind of feels like lead when you pick it up. Opal is rather light in weight, and gains density as it crystalizes, but even the chalcedony is much lighter than the barite.

Many people mistake dendrites as plant fossils as they kind of look like them. Dendrites though are really manganese crystals that form in the cracks or on the surface of rocks. And they can occur with a variety of rocks. I even have dendritic soapstone and dendritiic copper ore.

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Welcome to the Rock Tumbling Hobby Forum where we share a love of rocks and a sense of community as enduring as the stones we polish. The RTH Forum of www.RockTumbling.com is an Amazon Associate site and we earn money from qualifying purchases you make after clicking on our links such as this Rock Tumbling Supplies on Amazon link for instance, or any of our various product ads and banners. By clicking our links every time you begin your Amazon shopping experience, you are generating a bit of revenue for the forum which helps us cover our expenses. Thank you for your support!