Rocks and Minerals B/C

[pikachu4919]

2022 Question Marathon Thread for Rocks and Minerals B/C.

Question Marathons Explained

[acornsquash24]

Let's start this since I don't wanna have all the geology events be dead.

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What is this specimen? (This is specimen A by the way)

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What is this specimen? (We'll call this specimen B)

What's the crystal system of specimen A?

Describe the characteristics of specimen B if is receives too much ultraviolet radiation.

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What is this phenomena?

[acornsquash24]

Thanks for posting, I was trying to find this question marathon for a while now because the 2022 link leads to Solar Systems

Click to Show Answer

Specimen A is Sodalite
Specimen B is Quartz var. Amethyst
Sodalite has an isometric crystal system
Amethyst will lose its color when exposed to high levels of UV radiation
Fluorescence 

[BennyTheJett]

Thanks for posting, I was trying to find this question marathon for a while now because the 2022 link leads to Solar Systems

Click to Show Answer

Specimen A is Sodalite
Specimen B is Quartz var. Amethyst
Sodalite has an isometric crystal system
Amethyst will lose its color when exposed to high levels of UV radiation
Fluorescence 

All are good but the last I was looking for dichroism

Your turn to write some questions!

[acornsquash24]

Oops I knew it couldn't be that easy...

I don't know how to attach images so I'll do some non-ID questions this time (you can probably tell I'm quite new at this). If you could teach me how to do so that would be great.
(I figured out how and I feel like an idiot)

1. Define piezoelectricity and name a mineral that is piezoelectric.
2. Dichroic minerals are always one of which 3 crystal systems?
3. What is the hardness of scoria?
4. Explain what causes color alteration in the following Quartz varieties: a. Milky, b. Smoky, c. Rose, d. Amethyst, and e. Rose quartz.
5. List the following in order of most to least common: Native copper, Hematite, Malachite, Stibnite

[acornsquash24]

[duplicated post]

[DragonTownEpic]

Click to Show Answer

1. Piezoelectricity is the phenomenon where a material will generate a current when mechanically stressed. Quartz is piezoelectric.
2. hexagonal, trigonal, tetragonal
3. 5 to 6
4a. Fluid inclusions during crystal formation
4b. Impurities of aluminum
4c. Titanium, Iron, or manganese impurities
4d. Iron impurities
4e. Duplicate of 4c.
5. Stibnite, Hematite, Malachite? not sure    

[acornsquash24]

1, 2, 4a, 4c, 4d, 4e are correct.

3, 4b, 5:

Click to Show Answer

3. I forgot to specify for the hardness according to the Moh's hardness scale, in which Scoria doesn't have a hardness because it's a rock. So your answer is fine.
4b. Smoky quartz gets its color from natural radiation
5. Hematite, Malachite, Stibnite, Native copper -- I would probably have to use my field guide to answer a question like this

Your turn! Or someone's turn I don't know. I'll try to make better questions next time.

[DragonTownEpic]

Your questions were great! It is now my turn.

Mineral A:

Mineral B:


1. Identify Minerals A and B.
2. Exceptional quantities of crystalline specimens of Mineral A have been found in what location?
3. Describe the process of creating synthetic crystals of Mineral A.
4. Mineral B is the primary ore for what metal?
5. Describe the luster of Mineral B.
6. Minerals A and B were used in what component of early radios?

[kman1234t]

Click to Show Answer

1. A- Zincite, B - Galena
2. New Jersey - Franklin and Sterling Hill Mines
3. Different ways, but one is the CZ method where a seed crystal of the mineral is dipped in molten feed material and eventually the molten material crystallizes forming a new part of the crystal.
4. Lead
5. Metallic/Dull
6. Crystal Detector