It's been a while since my last post..here is a spray of Goethite (tentative ID) with Quartz. They grew inside an agate geode from Argentina. Nothing like trying to illuminate something in a cavity. Under the scope these Goethite crystals tend to either look like silver mirrors or black, so this image is sort of a compromise. They do have some color but the luster obscures it. Next I'll probably try cross polarization.
Stacked at 5X
F.O.V. 3.7mm
Goethite in Quartz
Moderators: rjlittlefield, ChrisR, Chris S., Pau
-
- Posts: 85
- Joined: Sun Mar 26, 2017 3:18 pm
- Location: Tennessee
- Contact:
Goethite in Quartz
Brad
-
- Posts: 109
- Joined: Sun May 10, 2020 12:56 pm
This is fantastic! I like how you can tell the quartz was the 2nd generation growing around one of the crystals on the right. Is this in one of the red amethyst geodes which hit the market about 2 years back?
I'll have to go back and check your prior posts to see more - mineral work is one of my primary interests. Was this under a true scope, or a 5x lens/objective mounted to a DSLR?
I'll have to go back and check your prior posts to see more - mineral work is one of my primary interests. Was this under a true scope, or a 5x lens/objective mounted to a DSLR?
-
- Posts: 85
- Joined: Sun Mar 26, 2017 3:18 pm
- Location: Tennessee
- Contact:
Glad you liked it, PhysicsMajor. This is actually from a small agate nodule. When I sawed it open it happened to have a hollow center with the Goethite as a bonus. You are correct that this was shot using a 5X microscope objective with a tube lens mounted on a DSLR. It's always good to meet another mineral lover.
Brad
-
- Posts: 109
- Joined: Sun May 10, 2020 12:56 pm
-
- Posts: 85
- Joined: Sun Mar 26, 2017 3:18 pm
- Location: Tennessee
- Contact:
Physicsmajor: As to the lighting..I was fortunate in that the crystals are somewhat parallel. This allowed me to use a diffused, but still rather directional LED light source oriented to minimize any specular reflections. This did create some shadows but it worked out OK. Nice uniform lighting tended to leave all the faces looking like mirrors. Hope that helps.
Brad
-
- Posts: 85
- Joined: Sun Mar 26, 2017 3:18 pm
- Location: Tennessee
- Contact: