Beautiful Aqua Blue/Green Marine!

This rock appears to be a piece of **malachite**, possibly with some chrysocolla or other copper minerals. Here's why:
1. **Coloration**: The green color is characteristic of malachite, which is a copper carbonate hydroxide mineral. The blue-green hue is typical for malachite when it's mixed with chrysocolla or other copper minerals. 2. **Banding and Texture**: Malachite often forms in banded patterns due to its fibrous crystal structure. The rock in the image shows some banding and a waxy to vitreous luster, which is consistent with malachite.
3. **Translucency**: Parts of the rock appear somewhat translucent, which can be a feature of malachite, especially in thinner sections.
4. **Inclusions**: The yellowish or brownish areas could be due to iron oxide or other mineral inclusions, which can sometimes be found associated with malachite.
However, without specific tests like a hardness test, streak test, or chemical analysis, this identification remains speculative. For a more precise identification: - **Hardness Test**: Malachite has a hardness of around 3.5 to 4 on the Mohs scale, meaning it can be scratched by a knife but not by a fingernail. - **Streak Test**: The streak of malachite would be green, which can help distinguish it from other minerals. - **Acid Test**: Malachite will effervesce (fizz) in hydrochloric acid due to its carbonate content.