14 3/4" x 2 1/4" Unmarked Black Onyx ? and 50 similar items

This is a 14 3/4 " tall black stone, I think onyx, obelisk, pyramid, monument. The base measures approximately 2 1/4" x 2 1/4". I purchased this in the late 1970s or 1980s. I cannot recall where I bought it. To the best of my recollection, I was told it was black onyx. I suppose it could be obsidian or another black stone. I have never had it tested. It has a high polish and the edges or corners are beveled. The top point is very sharp. It wobbles a little. I checked it carefully and saw and felt no chips, cracks, fleabites, or scratches. I collected obelisks and displayed them on a silver mirrored tray. It reminded me of a cityscape. I am downsizing and I am selling most everything. Non-smoking household. Shipping includes insurance.