G-10 is quite heavy too. Heavier than micarta, slightly.
Walnut or curly maple, natural as in unstabilized, is probably some of the lightest stuff that's still perfectly sound for use. Buckeye would be very light but it's one of the very few I doubt I'd use unstabilized, though if you had a pretty solid piece of figured stuff it'd probably be just fine.
Stabilizing makes most woods approach, or in some cases exceed, the weight of micarta and g-10.