Explore Amazing Blue Basaltic Rock 3000 year old in 10000 year old Kaimuki Lava Dome Honolulu Oahu

Summary

In this geological study, we explore different types of rocks to distinguish between igneous and sedimentary forms. The Blue Rock, a fresh igneous sample, is tested with acid to confirm its composition, showing no reaction due to the lack of calcium carbonate. In contrast, a rock from Diamond Head Crater, rich in calcite crystals, reacts with acid, indicating its sedimentary nature. The volcanic history of Diamond Head led to the formation of calcite crystals, while the Kaimuki Lava Dome's Blue Rock is an igneous intrusion. This study highlights the geological differences in rock origins and compositions.

Takeaways

• 😀 The Blue Rock is a fresh, unweathered igneous rock that hasn't been exposed to weathering agents.
• 😀 An acid test is conducted to identify the type of rock based on its reaction to the acid.
• 😀 The Blue Rock does not react to acid because it lacks calcium carbonate, indicating it is igneous and not sedimentary.
• 😀 Sedimentary rocks typically contain calcium carbonate, which reacts with acid, unlike igneous rocks like the Blue Rock.
• 😀 Rocks from Diamond Head Crater contain calcite crystals, which are composed of calcium carbonate, reacting to acid.
• 😀 Calcite crystals in Diamond Head rocks are often mistakenly referred to as diamonds but are actually fools' diamonds.
• 😀 The Diamond Head Crater's rocks have undergone weathering processes, unlike the fresh volcanic rock from the Blue Rock site.
• 😀 The presence of calcium carbonate in Diamond Head rocks signifies a different geological formation compared to the Kaimuki Lava Dome.
• 😀 The Blue Rock's igneous nature is attributed to its formation from volcanic lava and lack of weathering over time.
• 😀 The geological tests help differentiate between igneous and sedimentary rocks by examining their chemical reactions.
• 😀 The Hawaiian volcanic sites like Diamond Head and the Kaimuki Lava Dome show different rock formations due to their unique geological histories.

Q & A

What is Blue Rock, and how is it classified?

Blue Rock is an igneous rock that has not been weathered or oxidized. It is considered fresh because it has not been exposed to the agents of weathering. The lack of reaction to acid confirms it is not a sedimentary rock.

Why doesn't Blue Rock react to acid?

Blue Rock does not react to acid because it lacks calcium carbonate, a key component of sedimentary rocks. This absence indicates that the rock is igneous and not sedimentary.

How can we distinguish igneous rocks from sedimentary rocks?

One way to distinguish igneous rocks from sedimentary rocks is through an acid test. Sedimentary rocks often contain calcium carbonate, which reacts with acid, releasing carbon dioxide. Igneous rocks, like Blue Rock, do not react because they lack this substance.

What does the acid test reveal about rocks from Diamond Head Crater?

The acid test on rocks from Diamond Head Crater reveals the presence of calcium carbonate, which reacts with the acid, releasing carbon dioxide gas. This reaction indicates that these rocks are sedimentary, not igneous.

What is the origin of the rocks found in Diamond Head Crater?

The rocks found in Diamond Head Crater are sedimentary. They were formed from volcanic ash that cemented together over time, creating layers. These rocks differ in origin from the Blue Rock, which is igneous and formed from lava.

What are 'fool's diamonds' found in the Diamond Head area?

The so-called 'fool's diamonds' found in the Diamond Head area are actually calcite crystals, not real diamonds. They are composed of calcium carbonate and often mistaken for diamonds due to their shiny appearance.

How do calcite crystals react to acid?

Calcite crystals react to acid by releasing carbon dioxide gas, which produces bubbles and creates a visible reaction. This is a key characteristic that helps distinguish them from real diamonds.

What is the Hawaiian name for Diamond Head Crater, and what does it mean?

The Hawaiian name for Diamond Head Crater is 'Leahi.' The name is associated with the volcano's appearance and local history, though it is often misinterpreted to imply the presence of actual diamonds.

Why is Blue Rock considered a volcanic intrusion?

Blue Rock is considered a volcanic intrusion because it is formed from lava that has intruded into other layers of rock. It is part of the igneous rock category and has a solid, unweathered composition.

What is the significance of the Kaimuki Lava Dome in the study of rocks?

The Kaimuki Lava Dome is significant because it provides an example of igneous rock formation. It serves as a comparison point to other geological features, such as Diamond Head Crater, to understand the differences between igneous and sedimentary rocks.