epub |eng | 2020-03-21 | Author:Garret Romaine

Chrysocolla Striking blue chrysocolla resembles turquoise. PHOTO COURTESY OF THE RICE NORTHWEST MUSEUM OF ROCKS AND MINERALS (Cu,Al)2H2Si2O5(OH)4·nH2O Family: Silicate Mohs: 2½–3½ Specific gravity: 1.9–2.4 Key test(s): Soft Likely locale(s): ...

epub |eng | 2020-06-15 | Author:Hall, Ashley [Hall, Ashley]

Many lobe-finned fish, like Tiktaalik roseae [ Tik-TAH-lick ROW-zee-ay], had fins with such sturdy bones that they could use them to pull themselves onto land! The lobe-finned fish of the ...