Jennite is a calcium silicate hydrate mineral of general chemical formula: Ca9Si6O18(OH)6·8H2O.
Jennite occurs as an alteration mineral in metamorphosed limestone and skarn. It typically occurs as vein and open space fillings as a late mineral phase. It also occurs in hydrated cement paste.
A first specimen of jennite found in 1966 at the Crestmore quarries (Crestmore, Riverside County, California, USA) was analysed and identified as a new mineral by Carpenter in 1966 (Carpenter, 1966). They named it in honour of its discoverer: Clarence Marvin Jenni (1896–1973) director of the Geological Museum at the University of Missouri.
In contrast to the first analysis made by Carpenter, jennite does not contain appreciable amount of sodium when the Crestmore specimen was reexamined (Gard, 1977).
The structure of jennite is made of three distinct modules: ribbons of edge-sharing calcium octahedra, silicate chains of wollastonite-type running along the b axis, and additional calcium octahedra on inversion centers. The hydroxyl groups are bonded to three calcium cations while no SiOH groups are observed (Bonaccorsi, 2004).
Hey, like a fallen angel I was on your side
You lighted the fire deep in my soul
Do you remember the stars shining bright?
I should retire under your control
In seven nights and days
Oh, you didn't think your thing would come crashing down
In seven lonely dreams
Oh, I know that you're not the one I'm waiting for
Seven nights, seven days
Seven nights, I carried the can
'Cause I let you go, all our bridges were burned
Oh boy, it's on the cards, I don't wanna return
Seven nights, seven days
Seven nights, you blew your chance
Love was not forever in your heart
Due to that we have to live apart
Nothing's forever, no use to try
There's no solution, don't make me blue
We tried together, I kiss you goodbye
This endless confusion should not come true
In seven nights and days
Oh, you didn't think your thing would come crashing down
In seven lonely dreams
Oh, I know that you're not the one that I'm waiting for
Seven nights, seven days
Seven nights, I carried the can
'Cause I let you go, all our bridges were burned
Oh boy, it's on the cards, I don't wanna return
Seven nights, seven days
Seven nights, you blew your chance
Love was not forever in your heart
Due to that we have to live apart
Seven nights, seven days
Seven nights, I carried the can
'Cause I let you go, all our bridges were burned
Oh boy, it's on the cards, I don't wanna return
Seven nights, seven days
Seven nights, you blew your chance
Love was not forever in your heart
Due to that we have to live apart