All birthstones are minerals but not all minerals are considered gems. We dive in to the facts, legends and history behind each birthstone.
We live in earthquake country. Learn about quake science, tsunamis and what you can do to prepare for the Big One in this web feature from 2002.
An introduction to the geologic history of Washington state.
For millennia, the Duwamish River sustained a diverse ecosystem before experiencing a dramatic transformation wrought by human engineering.
Seattle is one of the most dramatically re-engineered cities in the United States.
The people who come on these tours of San Juan Island are curious about one thing: stories of people and place.
Turquoise is composed of hydrated copper and aluminum phosphate. It forms when circulating water alters other aluminum-rich rocks in desert environments.
Some citrine actually began as purple amethyst, but heat from nearby molten rock changed it to a warm yellow color.
The presence of water in the mineral structure allows geologists to determine the temperature of the rock at the time the opal formed.
Sapphire is any form of corundum that is not red, as red varieties are called rubies.
Peridot is type of olivine, and comes in various shades of green, from light to a brilliant olive green.