"River Rock" is a pretty multi hued medium to dark gray tonal with silver Selina sparkle.
Deluxe Sparkle - 75% Superwash Merino wool / 20% Nylon / 5% Stellina
438 yards/100 gm - fingering weight
The yarn will arrive in a twisted skein.
Multiple skeins are photographed to allow you a good look at the yarn.