Volcano Ko'olau Ash Raw Minerals Lapilli Pumice Lava Bombs Stones Rocks Collecting

Volcanic Ash sample Raw Minerals Lapilli Pumice Lava Bombs Stones Rocks for Collection.
Rare collection of volcanic Sand ash from the eruption of the Ko'alau Ranges Volcano in pre-historic era. The sample consists of Lava and Pumice fragments covered with a volcanic Ash of coarse or medium gray grain.
The material was taken from the volcanic sand beach on the island of O'ahu (Hawaii - USA), in the census-designated place (CDP) of Hau'ula, Ko'olauloa district, Honolulu county).

Available on our website, besides ashes, pumice and bombs, also various volcanic rocks, such as Apache Teardrops, sulfur, obsidian, tuff, crystal chalk, etc.

Volcanic ash consists of small tephra, which are bits of pulverized rock and glass created by volcanic eruptions, less than 2 millimetres (0.1 inch) in diameter . Ash is created when the usually violent nature of an eruption involving steam results in the magma and solid rock surrounding the vent being torn into particles of clay to sand size.
Every ash samples is labelled and bagged in a vial with cap (mm 44 x 10), so thay can easily be removed if required for study under a microscope.
As with all volcanic ash, the material should be handled with care and not inhaled.

O'ahu is the third largest of the Hawaiian islands. It hosts about two thirds of the population of the state of Hawaii (USA). The capital, Honolulu, is located on the southeastern coast. Including the small associated islands, it is the twentieth largest island in the United States.
The island consists of two separate shield volcanoes: the Wai'anae and the Ko'olau Ranges, with a large "valley" or saddle (the central O'ahu Plain) between them. The highest point is Ka'ala in the Wai'anae chain, which rises to 1,220 m above sea level.
Ko'olau Range is a name given to the fragmented dormant residue of the eastern shield volcano of the Hawaiian island of O'ahu. It was designated National Natural Landmark in 1972.
Ko'olau Range is not a mountain range in the normal sense, because it is formed as a single mountain called Ko'olau Volcano (ko'olau means "windward" in Hawaiian). What remains of Ko'olau is the western half of the original volcano that was destroyed in prehistoric times when the entire eastern half, including most of the summit caldera, slipped cataclysmatically into the Pacific Ocean. The remains of this ancient volcano are found as huge fragments littered for nearly 160 km on the ocean floor northeast of O'ahu. Kāne'ohe Bay is what remains of the ancient caldera of the volcano after the slide. The modern Ko'olau mountain rises behind the city of Honolulu, on its slopes and valleys are most of the residential areas of Honolulu.
It is thought that the volcano broke out for the first time on the ocean floor more than 2.5 million years ago. Eventually it reached sea level and continued to grow in height up to about 1.7 million years ago, when it became dormant. The volcano remained inactive for hundreds of thousands of years, during which the erosion of time devoured the first flat slopes of the shield-shaped mountain and the whole mass diminished considerably. The highest elevation perhaps exceeded 3,000 meters; today, the peak of the highest peak, Pu'u Konahuanui, is only 945 meters.
After hundreds of thousands of years of dormancy, the Ko'olau volcano began to explode again. About thirty eruptions over the past 500,000 years have created many of the landmarks around Eastern O'ahu, such as Diamond Head, Koko Head (Hanauma Bay), Punchbowl Crater, Tantalus, Āliapa'akai, the island of Manaña and more young, Koko Crater, and collectively known as the volcanic series of Honolulu, a collection of monogenic volcanic events on the Hawaiian island of O'ahu. The events were dated between 800,000 and 30,000 years ago. Geologists do not always agree on the dates of the most recent eruptions, some dating them about 32,000 years ago, others up to 10,000 years ago. Although most people do not consider those craters as volcanoes it is also believed that there is at least a remote possibility that the Ko'olau volcano explodes again.