Try to use several independent descriptive words, since "very heavy" will also match "heavy" and "very soft". Also, don't use negatives (such as "not transparent").
A Glossary of Terms below which describes the consistent set of
terms used in this mineral database, and offers suggestions for effective searching.
The search program takes the list of words and retrieves the HTML documents that
contain any of the words in the list. There are no logical operators such as AND or OR or NOT. Documents are assigned a value based upon
How many times the words appear in the document.
How frequently the words occur (words that only appear in a few documents are more valuable).
Capitalized phrases (such as Calcium Carbonate) are also compared as matching word pairs and are assigned a high value.
All words do not need to match, but more matches result in a higher score.
At most 40 documents are retrieved.