# ``biogenic_silica_ug``
## Properties
:dimensions: N_PROF, N_LEVELS
:dtype: float64
## Default Attributes
| Attribute | Value |
|-----|-----|
|``whp_name`` | ``BSI`` |
|``whp_unit`` | ``UG/L`` |
|``units`` | ``ug/l`` |
|``C_format`` | ``%9.2f`` |
|``C_format_source`` | ``database`` |
## Description
Biogenic Silica, also called opal. Chemically is hydrated silica, SiO2 nH2O. Biogenic silica is in particulate form.