Dense irregular connective tissue. Dense irregular connective tissue has fibers that are not arranged in parallel bundles as in dense regular connective tissue. Substances formed[edit] This tissue comprises a large portion of the dermis. This type of tissue is also in the protective white layer of the eyeball and in the deeper skin layers.
Definition of VERMICULITE. : any of various micaceous minerals that are hydrous silicates resulting usually from expansion of the granules of mica at high temperatures to give a lightweight highly water-absorbent material.
Many who used vermiculite for gardening may be a bit worried about recent health scares related to vermiculite. Vermiculite is a naturally occurring mineral that is mined and processed into a puffy, lightweight granule mixed with soil to improve aeration and drainage. It used to be inexpensive and easy to get. Compost does add vital nutrients, but if you need to permanently improve drainage, vermiculite is a great solution. 2  Slightly raises pH: Vermiculite is pH neutral, around 7.0 or so, but because of some compounds found within it, it can slightly raise pH, a plus for acidic soils.