It is often acknowledged that the search for life on Mars might produce false positive results,
particularly via the detection of objects, patterns or substances that resemble the products of …

Chitin as one of the fundamental structural biological materials widely occurring in broad
diversity of uni-and multicellular organisms focuses attention of experts in biomedicine …

Agate—a spectacular form of SiO2 and a famous gemstone—is commonly characterized as
banded chalcedony. In detail, chalcedony layers in agates can be intergrown or intercalated …

Hundreds of tubular and spiral specimens resembling terrestrial tube worms and worm
tubes were photographed in the soil and atop and protruding from “rocks” on Sols 177, 199 …

Agates in Paleocene/Eocene tuffs from El Picado/Los Indios, Cuba were investigated to
characterize the mineral composition of the agates and to provide data for the reconstruction …

The formation of agate is related to syngenetic or epigenetic magmatic hydrothermal fluids.
Trace elements incorporated during the alteration of host rocks caused by hydrothermal …

Agate veins and nodules occur in the Lece Volcanic Complex (Oligocene-Miocene) situated
in the south of Serbia and occupying an area of 700 km2. This volcanic complex is …

In the ancient and recent past, various niches on Mars were habitable and possibly
inhabited by organisms that have evolved and adapted to extreme surface and subsurface …

Textures and whole-rock chemistry, as well as mineral composition, were analyzed in
megaspherulites (high-temperature crystallization domains [HTCDs]) that formed in different …

Secondary minerals occur within the tholeiitic basalts of Salsette Island in the greater
Mumbai region, as well as in other localities in the Deccan Volcanic Province (DVP) …