Je was op zoek naar: parallel in form (Engels - Tagalog)

sufficient in form
all form without substance

being sufficient in form and substance
sapat sa anyo

they are strong in form but lacking in substance.
malalakas ang mga ito sa anyo, ngunit kulang sa diwa.

metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form".[1] the original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 °c) and pressure (1500 bars),[2] causing profound physical and/or chemical change. the protolith may be a sedimentary rock, an igneous rock or another older metamorphic rock.
metamorphism