| 11. | It occurs in a quartz vein within a diabase-porphyry shear zone.
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| 12. | Once an active volcano, the diabase mountain was formed 160 million years ago.
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| 13. | These particular ringing rock boulder fields formed from a rock type called olivine diabase.
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| 14. | Both the normal and olivine diabase rocks are dark grey to black in color.
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| 15. | The diabase on V�stg�tabergen known locally for staircases.
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| 16. | The ridge consists largely of diabase, much like its sister formation East Rock.
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| 17. | In 1990 Widenfalk had acquired a small diabase block of highest quality and blackness.
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| 18. | Skansen has 4-5 metre thick walls made of granite, gneiss and diabase.
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| 19. | Farming use was limited due to the hard diabase rock in the mountain s soil.
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| 20. | The Australian occurrences include a number of Proterozoic to Cambrian age diabase and gabbro sills.
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