The heart is a rock.
Sedimentary.
Pressure crumbles - weakness' fidelity.
Isolation's pressure.
Loneliness presents fissure.
Together, all.
Altogether, everything.
The heart is a rock - strong.
Strong in totality.
In its community.
The heart is sedimentary.
A crust as whole, a chip itself.
No chalcedony, no decoration.
Nothing placed on a shelf.
This is the heart.
Sedimentary.
This is a fantastic start. Poetry compilations always benefit from having a strong start—you have to hook people in. This sounds very much like a poem Maud would write, up and down. Expression through geology. Absolutely solid! (like a rock...)