Mineral identification

[KarmaPolice]

Hi,

Found that on the roof of my office hiding in one of the block rocks, what is it? (crystal quartz?)

Thanks in advance.

 

Edited August 1, 2021 by KarmaPolice

[BMc]

IMO, looks like Rhyolite with a  vug in the rock caused by trapped gasses, containing possibly calcite or quartz crystals .

[chrisski]

To me quartz and calcite are hard to tell apart:

https://www.qsiquartz.com/what-are-the-differences-between-the-minerals-calcite-and-quartz/

I used to think a;; white crystals like that were automatically quartz, but if its softer could be calcite.

[Morlock]

Put a few drops of vinegar on the crystals. If it fizzes after a few minutes it's calcite. If not..it's quartz.

[BMc]

2 hours ago, BMc said:

IMO, looks like Rhyolite with a  vug in the rock caused by trapped gasses, containing possibly calcite or quartz crystals .

 

2 hours ago, BMc said:

IMO, looks like Rhyolite with a  vug in the rock caused by trapped gasses, containing possibly calcite or quartz crystals .

Possibly a Dog Tooth calcite geode encased in the rock?

[KarmaPolice]

Thanks for your answers, as you suggested, I will try the put on it some vinegar or screach it on glass to check it out.

[Morlock]

6 hours ago, KarmaPolice said:

Thanks for your answers, as you suggested, I will try the put on it some vinegar or screach it on glass to check it out.

It will be a slow developing fizz if it's calcite.