https://meanings.crystalsandjewelry.com/agate/
Here is an excerpt with descriptive info about it (the link to the entire article is below):
"This
alone makes Black Agate very appropriate for that reason alone – yet
beyond that, the energy surrounding Black Agate is soothing in its own
right.
"It is also recognized as a stone of potential, so it’s just as high in uses for those of us still living in the material world.
"It
activates ideas, enriches your sense of inspiration and is almost
hypnotic to look at – solid black, yet capturing the light in simple,
elegant ways.
"Of
course, this is just one of the many Agate colors, but oftentimes the
stone has common values and properties that make any choice of color the
right one.
"It’s
a very protective stone that can ward off any kind of harm or negative
energy. Keep it inside your purse or slip it in your pocket whenever and
wherever.
"The
beauty of this is that this stone cannot help but calm and inspire you,
even if you do not fully understand the overall Agate meaning and what
it can offer you.
"Likewise,
anyone who is a skeptic of New Age healing or similar spiritual
practices can similarly benefit from having an Agate stone close at hand
for good luck.
"It will bestow its blessings upon yourself and your nearest and dearest even without any direct belief, faith or encouragement.
"The
immediate beauty of Agate stones, together with their cost
effectiveness and how easily a skilled craftsman or woman can shape the
rock, makes it a popular gift.
"Therefore,
you might be encouraged to find that you can help someone you love
obtain the benefits of Agate and its influence, without insisting they
follow this world view.
"Simply
offer Agate in the form of jewelry, stitched as a sequin into clothing,
or via an otherwise thoughtful handmade gift, to really convey its
positive energies to anyone of your choosing.
"While
those not inclined towards these matters may not thank you directly,
you may well find that he or she enjoys a sudden upswing in good health,
relaxed outlooks and overall peace of mind!"
Red Agate
Rituals
Place in the center of the circle when
we invoke spirits or forces that tend to be deceptive or that may
confuse us. If we place it next to a red or orange candle, we will
strengthen the bonds of friendship, affection between father and son,
and relationships with our partner, making the bond more friendly and
pleasant.
***
Ritual: Red agate should be used to amplify the effects of candle magic.
https://www.psychic-revelation.com/reference/a_d/crystals/agate_red.html
http://www.kabeeragate.com/blog/blood-agate-or-red-agate-stone-meaning/
Moonstonehttps://www.crystalvaults.com/crystal-encyclopedia/moonstone
Indian Agate
https://www.karmaarm.com/collections/gemstone-agate-india
Opal
https://mycrystalpedia.wordpress.com/o/opal/
Red Jasper
https://www.crystalvaults.com/crystal-encyclopedia/red-jasper